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Microsoft PL-400 Practice Test 13

Question 120

A plug-in creates an Entity with the display name instead of a logical table name and receives a fault. Which Power Platform extension or architecture change BEST addresses the core requirement?

  1. Use expressions such as coalesce, empty, formatDateTime and guarded JSON parsing with explicit type assumptions.
  2. Use IOrganizationService Retrieve/Update/ExecuteRequest operations from a supported server-side context and handle typed Entity logical names.
  3. Use a stable correlation/business key, durable receipt and bounded retry logic in Azure Functions consuming Power Platform events.
  4. Use Azure Functions to offload expensive work from synchronous Dataverse plug-ins while authenticating separately and tracking completion.

Explanation

Correct Answer

B:

Use IOrganizationService Retrieve/Update/ExecuteRequest operations from a supported server-side context and handle typed Entity logical names. This choice implements the controlling platform requirement rather than masking the symptom. The Organization service runs against Dataverse business rules and caller permissions; object assignments are not yet persisted updates. Verify the change using: Inspect service proxy context, column sets, record IDs, OrganizationRequest type and fault codes.

Incorrect Answers

A:

Use expressions such as coalesce, empty, formatDateTime and guarded JSON parsing with explicit type assumptions. That action addresses Power Automate expressions null coalesce and safe parsing instead. A missing property is not always equivalent to an empty string; expression behavior depends on data type. For this case, the targeted action is: Use IOrganizationService Retrieve/Update/ExecuteRequest operations from a supported server-side context and handle typed Entity logical names.

C:

Use a stable correlation/business key, durable receipt and bounded retry logic in Azure Functions consuming Power Platform events. That action addresses Azure Function idempotent integration recovery instead. At-least-once messages and function retries require idempotency at the actual business operation. For this case, the targeted action is: Use IOrganizationService Retrieve/Update/ExecuteRequest operations from a supported server-side context and handle typed Entity logical names.

D:

Use Azure Functions to offload expensive work from synchronous Dataverse plug-ins while authenticating separately and tracking completion. That action addresses Azure Functions for long-running Dataverse work instead. Function execution is not automatically atomic with the Dataverse operation that queued it. For this case, the targeted action is: Use IOrganizationService Retrieve/Update/ExecuteRequest operations from a supported server-side context and handle typed Entity logical names.

Question 121

An agent can invoke an unrestricted updateAccount MCP tool without a confirmation step for financial data. Which observable test result BEST confirms that the intended Power Platform component behaves correctly?

  1. The receiving agent produces a traceable response with correct customer scope and no unintended action handoff.
  2. The agent reads authorized records and cannot modify a customer account through an undeclared or unapproved tool.
  3. The notification references the committed entity identifier without unnecessarily extending an interactive database transaction.
  4. Related writes either commit in the intended atomic scope or fail with precise recoverable evidence.

Explanation

Correct Answer

B:

The agent reads authorized records and cannot modify a customer account through an undeclared or unapproved tool. This is an observable application, data or security outcome, not merely a successful build message. MCP advertises callable tools; their presence does not override Dataverse role-based authorization.

Incorrect Answers

A:

The receiving agent produces a traceable response with correct customer scope and no unintended action handoff. This result validates Foundry to Copilot Studio agent orchestration instead of the component in question. Here the specific acceptance check is: The agent reads authorized records and cannot modify a customer account through an undeclared or unapproved tool.

C:

The notification references the committed entity identifier without unnecessarily extending an interactive database transaction. This result validates Dataverse PostOperation plug-in and after-save evidence instead of the component in question. Here the specific acceptance check is: The agent reads authorized records and cannot modify a customer account through an undeclared or unapproved tool.

D:

Related writes either commit in the intended atomic scope or fail with precise recoverable evidence. This result validates ExecuteMultiple transactions and batch scope instead of the component in question. Here the specific acceptance check is: The agent reads authorized records and cannot modify a customer account through an undeclared or unapproved tool.

Question 122

A synchronization job processes only the first 5,000 contacts because it ignores the nextLink continuation. Which TWO complementary steps provide the intended implementation AND the evidence needed to validate it? Select TWO.

  1. Use the Dataverse Web API with logical names, $select, encoded $filter and @odata.nextLink pagination instead of retrieving unrestricted rows.
  2. For 429 or service-protection responses use documented Retry-After and bounded exponential backoff with idempotent processing.
  3. Inspect request URI, OData filters, prefer header, continuation link, lookup annotation and calling user privileges.
  4. Multiple parent flows call the same versioned validation step with consistent results and no personal credentials.
  5. Inspect evaluator cases, tool traces, policy refusal tests, human approval status, error rates and rollback evidence.

Explanation

Correct Answers

A:

Use the Dataverse Web API with logical names, $select, encoded $filter and @odata.nextLink pagination instead of retrieving unrestricted rows. This choice implements the controlling platform requirement rather than masking the symptom. A page-size hint or first result set does not guarantee the entire data collection has been returned. Verify the change using: Inspect request URI, OData filters, prefer header, continuation link, lookup annotation and calling user privileges. This is the implementation half of the required two-step answer.

C:

Inspect request URI, OData filters, prefer header, continuation link, lookup annotation and calling user privileges. These observations separate this failure from adjacent capabilities or permissions. A page-size hint or first result set does not guarantee the entire data collection has been returned. The relevant implementation is: Use the Dataverse Web API with logical names, $select, encoded $filter and @odata.nextLink pagination instead of retrieving unrestricted rows. This is the diagnostic/verification half of the required two-step answer.

Incorrect Answers

B:

For 429 or service-protection responses use documented Retry-After and bounded exponential backoff with idempotent processing. This step belongs to Dataverse API service-protection throttle retry rather than the complementary pair here. The required action is: Use the Dataverse Web API with logical names, $select, encoded $filter and @odata.nextLink pagination instead of retrieving unrestricted rows. And its evidence is: Inspect request URI, OData filters, prefer header, continuation link, lookup annotation and calling user privileges.

D:

Multiple parent flows call the same versioned validation step with consistent results and no personal credentials. This step belongs to Child flows and solution connection references rather than the complementary pair here. The required action is: Use the Dataverse Web API with logical names, $select, encoded $filter and @odata.nextLink pagination instead of retrieving unrestricted rows. And its evidence is: Inspect request URI, OData filters, prefer header, continuation link, lookup annotation and calling user privileges.

E:

Inspect evaluator cases, tool traces, policy refusal tests, human approval status, error rates and rollback evidence. This step belongs to Agent evaluation and human approval for side effects rather than the complementary pair here. The required action is: Use the Dataverse Web API with logical names, $select, encoded $filter and @odata.nextLink pagination instead of retrieving unrestricted rows. And its evidence is: Inspect request URI, OData filters, prefer header, continuation link, lookup annotation and calling user privileges.

Question 123

A price handler calls fireOnChange on the same field each time it updates a calculated total. Which evidence should the developer inspect FIRST to distinguish the root cause or verify the prerequisite?

  1. Check handler registration, setValue calls, fireOnChange usage, event order, duplicate registration and execution depth.
  2. Inspect event handler properties, passExecutionContext setting, formContext acquisition, loaded form attributes and handler scope.
  3. Inspect control manifest property of-type, usage, component namespace, platform libraries and compiled resource paths.
  4. Inspect selected connection ID, connector operation, signed-in user's rights, environment binding and app host context.

Explanation

Correct Answer

A:

Check handler registration, setValue calls, fireOnChange usage, event order, duplicate registration and execution depth. These observations separate this failure from adjacent capabilities or permissions. Setting an attribute value does not always trigger OnChange automatically; explicit event invocation can create loops. The relevant implementation is: Register OnChange handlers once, target supported events and prevent event-recursion when setting attribute values programmatically.

Incorrect Answers

B:

Inspect event handler properties, passExecutionContext setting, formContext acquisition, loaded form attributes and handler scope. These checks are relevant to Model-driven formContext from execution context, but are not the most discriminating first evidence for this case. Inspect instead: Check handler registration, setValue calls, fireOnChange usage, event order, duplicate registration and execution depth.

C:

Inspect control manifest property of-type, usage, component namespace, platform libraries and compiled resource paths. These checks are relevant to PCF ControlManifest inputs and resources, but are not the most discriminating first evidence for this case. Inspect instead: Check handler registration, setValue calls, fireOnChange usage, event order, duplicate registration and execution depth.

D:

Inspect selected connection ID, connector operation, signed-in user's rights, environment binding and app host context. These checks are relevant to Power Apps code app connectors and environment binding, but are not the most discriminating first evidence for this case. Inspect instead: Check handler registration, setValue calls, fireOnChange usage, event order, duplicate registration and execution depth.

Question 124

A Power App needs shipment tracking from a third-party HTTPS endpoint and the team wants to register a Dataverse plug-in instead. Which TWO complementary steps provide the intended implementation AND the evidence needed to validate it? Select TWO.

  1. Inspect client session diagnostics, plug-in trace logs, flow run IDs, app request headers, telemetry sampling and alert thresholds.
  2. Use Microsoft Foundry for custom coded model orchestration requiring extensible agent engineering and integrate through supported Power Platform endpoints when needed.
  3. Inspect data location, required transaction participation, authentication type, operation contract, caller scope and rate limits.
  4. The managed solution imports into a clean test environment without unexplained missing dependency failures.
  5. Design a custom connector for an external REST capability and a Dataverse custom API for a supported reusable business operation inside Dataverse.

Explanation

Correct Answers

C:

Inspect data location, required transaction participation, authentication type, operation contract, caller scope and rate limits. These observations separate this failure from adjacent capabilities or permissions. A connector exposes external services while a custom API defines a Dataverse operation; they are not interchangeable transaction models. The relevant implementation is: Design a custom connector for an external REST capability and a Dataverse custom API for a supported reusable business operation inside Dataverse. This is the diagnostic/verification half of the required two-step answer.

E:

Design a custom connector for an external REST capability and a Dataverse custom API for a supported reusable business operation inside Dataverse. This choice implements the controlling platform requirement rather than masking the symptom. A connector exposes external services while a custom API defines a Dataverse operation; they are not interchangeable transaction models. Verify the change using: Inspect data location, required transaction participation, authentication type, operation contract, caller scope and rate limits. This is the implementation half of the required two-step answer.

Incorrect Answers

A:

Inspect client session diagnostics, plug-in trace logs, flow run IDs, app request headers, telemetry sampling and alert thresholds. This step belongs to Cross-service monitoring and alert design rather than the complementary pair here. The required action is: Design a custom connector for an external REST capability and a Dataverse custom API for a supported reusable business operation inside Dataverse. And its evidence is: Inspect data location, required transaction participation, authentication type, operation contract, caller scope and rate limits.

B:

Use Microsoft Foundry for custom coded model orchestration requiring extensible agent engineering and integrate through supported Power Platform endpoints when needed. This step belongs to Microsoft Foundry versus Power Platform agent boundary rather than the complementary pair here. The required action is: Design a custom connector for an external REST capability and a Dataverse custom API for a supported reusable business operation inside Dataverse. And its evidence is: Inspect data location, required transaction participation, authentication type, operation contract, caller scope and rate limits.

D:

The managed solution imports into a clean test environment without unexplained missing dependency failures. This step belongs to Solution component dependency management rather than the complementary pair here. The required action is: Design a custom connector for an external REST capability and a Dataverse custom API for a supported reusable business operation inside Dataverse. And its evidence is: Inspect data location, required transaction participation, authentication type, operation contract, caller scope and rate limits.

Question 125

A frontend traces access tokens and user-submitted medical notes into analytics by default. Which Power Platform extension or architecture change BEST addresses the core requirement?

  1. Register OnChange handlers once, target supported events and prevent event-recursion when setting attribute values programmatically.
  2. Pass the execution context to registered form handlers and obtain formContext instead of relying on deprecated global Xrm.Page.
  3. Configure allowed origins for scripts, styles, connections and frames according to the code app CSP rather than setting a permissive wildcard.
  4. Use Application Insights telemetry with correlation IDs and privacy-safe fields to monitor code-app failures and end-to-end calls.

Explanation

Correct Answer

D:

Use Application Insights telemetry with correlation IDs and privacy-safe fields to monitor code-app failures and end-to-end calls. This choice implements the controlling platform requirement rather than masking the symptom. Telemetry needs context and privacy controls; a page-view count cannot diagnose specific failed API calls. Verify the change using: Inspect browser network errors, telemetry configuration, sampling, request correlation, exception events and user consent.

Incorrect Answers

A:

Register OnChange handlers once, target supported events and prevent event-recursion when setting attribute values programmatically. That action addresses OnChange handlers and loop prevention instead. Setting an attribute value does not always trigger OnChange automatically; explicit event invocation can create loops. For this case, the targeted action is: Use Application Insights telemetry with correlation IDs and privacy-safe fields to monitor code-app failures and end-to-end calls.

B:

Pass the execution context to registered form handlers and obtain formContext instead of relying on deprecated global Xrm.Page. That action addresses Model-driven formContext from execution context instead. The Client API formContext comes from the event context; standalone Web API calls do not expose a form object. For this case, the targeted action is: Use Application Insights telemetry with correlation IDs and privacy-safe fields to monitor code-app failures and end-to-end calls.

C:

Configure allowed origins for scripts, styles, connections and frames according to the code app CSP rather than setting a permissive wildcard. That action addresses Code app Content Security Policy configuration instead. A CSP error cannot be reliably fixed by disabling every restriction; precise origins should be justified. For this case, the targeted action is: Use Application Insights telemetry with correlation IDs and privacy-safe fields to monitor code-app failures and end-to-end calls.

Question 126

A flow concatenates a null account number into a key and writes an invalid cross-system identifier. Which TWO complementary steps provide the intended implementation AND the evidence needed to validate it? Select TWO.

  1. Inspect trigger outputs, actual null/empty shapes, dynamic content paths, expression result and test payloads.
  2. Use expressions such as coalesce, empty, formatDateTime and guarded JSON parsing with explicit type assumptions.
  3. Inspect identity object ID, token audience, Dataverse app user, table privileges, role assignments and secret usage.
  4. The notification references the committed entity identifier without unnecessarily extending an interactive database transaction.
  5. Use child flows inside solutions to share reusable logic with declared inputs, outputs and correct run-only connection behavior.

Explanation

Correct Answers

A:

Inspect trigger outputs, actual null/empty shapes, dynamic content paths, expression result and test payloads. These observations separate this failure from adjacent capabilities or permissions. A missing property is not always equivalent to an empty string; expression behavior depends on data type. The relevant implementation is: Use expressions such as coalesce, empty, formatDateTime and guarded JSON parsing with explicit type assumptions. This is the diagnostic/verification half of the required two-step answer.

B:

Use expressions such as coalesce, empty, formatDateTime and guarded JSON parsing with explicit type assumptions. This choice implements the controlling platform requirement rather than masking the symptom. A missing property is not always equivalent to an empty string; expression behavior depends on data type. Verify the change using: Inspect trigger outputs, actual null/empty shapes, dynamic content paths, expression result and test payloads. This is the implementation half of the required two-step answer.

Incorrect Answers

C:

Inspect identity object ID, token audience, Dataverse app user, table privileges, role assignments and secret usage. This step belongs to Managed identity Azure Function to Dataverse rather than the complementary pair here. The required action is: Use expressions such as coalesce, empty, formatDateTime and guarded JSON parsing with explicit type assumptions. And its evidence is: Inspect trigger outputs, actual null/empty shapes, dynamic content paths, expression result and test payloads.

D:

The notification references the committed entity identifier without unnecessarily extending an interactive database transaction. This step belongs to Dataverse PostOperation plug-in and after-save evidence rather than the complementary pair here. The required action is: Use expressions such as coalesce, empty, formatDateTime and guarded JSON parsing with explicit type assumptions. And its evidence is: Inspect trigger outputs, actual null/empty shapes, dynamic content paths, expression result and test payloads.

E:

Use child flows inside solutions to share reusable logic with declared inputs, outputs and correct run-only connection behavior. This step belongs to Child flows and solution connection references rather than the complementary pair here. The required action is: Use expressions such as coalesce, empty, formatDateTime and guarded JSON parsing with explicit type assumptions. And its evidence is: Inspect trigger outputs, actual null/empty shapes, dynamic content paths, expression result and test payloads.

Question 127

A developer hardcodes a Dataverse app-secret value into a client-side environment file to make a code app work. Which TWO complementary steps provide the intended implementation AND the evidence needed to validate it? Select TWO.

  1. The component degrades predictably on an unsupported host without exposing data or crashing.
  2. Use Power Apps Monitor and browser developer tools to reproduce request errors, isolate code failures and distinguish host from API issues.
  3. Configure a code app's Power Platform connections and permissions using supported connection references rather than direct embedded API secrets.
  4. Inspect selected connection ID, connector operation, signed-in user's rights, environment binding and app host context.
  5. Review browser CSP violation logs, required identity endpoints, connector hosts, unsafe-inline usage and approved headers.

Explanation

Correct Answers

C:

Configure a code app's Power Platform connections and permissions using supported connection references rather than direct embedded API secrets. This choice implements the controlling platform requirement rather than masking the symptom. Code apps still require appropriate app and data-source authorization even with a custom React frontend. Verify the change using: Inspect selected connection ID, connector operation, signed-in user's rights, environment binding and app host context. This is the implementation half of the required two-step answer.

D:

Inspect selected connection ID, connector operation, signed-in user's rights, environment binding and app host context. These observations separate this failure from adjacent capabilities or permissions. Code apps still require appropriate app and data-source authorization even with a custom React frontend. The relevant implementation is: Configure a code app's Power Platform connections and permissions using supported connection references rather than direct embedded API secrets. This is the diagnostic/verification half of the required two-step answer.

Incorrect Answers

A:

The component degrades predictably on an unsupported host without exposing data or crashing. This step belongs to PCF WebAPI Device and Utility usage rather than the complementary pair here. The required action is: Configure a code app's Power Platform connections and permissions using supported connection references rather than direct embedded API secrets. And its evidence is: Inspect selected connection ID, connector operation, signed-in user's rights, environment binding and app host context.

B:

Use Power Apps Monitor and browser developer tools to reproduce request errors, isolate code failures and distinguish host from API issues. This step belongs to Code app Monitor and browser troubleshooting rather than the complementary pair here. The required action is: Configure a code app's Power Platform connections and permissions using supported connection references rather than direct embedded API secrets. And its evidence is: Inspect selected connection ID, connector operation, signed-in user's rights, environment binding and app host context.

E:

Review browser CSP violation logs, required identity endpoints, connector hosts, unsafe-inline usage and approved headers. This step belongs to Code app Content Security Policy configuration rather than the complementary pair here. The required action is: Configure a code app's Power Platform connections and permissions using supported connection references rather than direct embedded API secrets. And its evidence is: Inspect selected connection ID, connector operation, signed-in user's rights, environment binding and app host context.

Question 128

A Foundry assistant calls Copilot Studio but drops the customer identifier and returns another case summary. Which evidence should the developer inspect FIRST to distinguish the root cause or verify the prerequisite?

  1. Inspect agent endpoint, correlation, delegated claims, response schema, tool approval and timeout behavior.
  2. Inspect assembly version, registered type, message filters, sandbox mode, image alias and effective solution layer.
  3. Inspect trigger type, filtering attributes, change type, OData row filter, trigger condition and run history.
  4. Inspect custom API uniqueness, bound/unbound setting, parameters, Execute privilege, registration and returned response shape.

Explanation

Correct Answer

A:

Inspect agent endpoint, correlation, delegated claims, response schema, tool approval and timeout behavior. These observations separate this failure from adjacent capabilities or permissions. A multi-agent conversation needs explicit context and security boundaries; text from one agent is not trusted instruction for another. The relevant implementation is: Integrate Foundry custom agents with Copilot Studio agents through supported connectors or contracts while preserving identity and handoff context.

Incorrect Answers

B:

Inspect assembly version, registered type, message filters, sandbox mode, image alias and effective solution layer. These checks are relevant to Plug-in Registration Tool and signed assembly deployment, but are not the most discriminating first evidence for this case. Inspect instead: Inspect agent endpoint, correlation, delegated claims, response schema, tool approval and timeout behavior.

C:

Inspect trigger type, filtering attributes, change type, OData row filter, trigger condition and run history. These checks are relevant to Power Automate Dataverse trigger filter columns and OData, but are not the most discriminating first evidence for this case. Inspect instead: Inspect agent endpoint, correlation, delegated claims, response schema, tool approval and timeout behavior.

D:

Inspect custom API uniqueness, bound/unbound setting, parameters, Execute privilege, registration and returned response shape. These checks are relevant to Dataverse custom API contract and plug-in execution, but are not the most discriminating first evidence for this case. Inspect instead: Inspect agent endpoint, correlation, delegated claims, response schema, tool approval and timeout behavior.

Question 129

A new code-app build is deployed but the published environment points to an older cached artifact and no smoke test runs. Which Power Platform extension or architecture change BEST addresses the core requirement?

  1. Use Power Apps Monitor and browser developer tools to reproduce request errors, isolate code failures and distinguish host from API issues.
  2. Implement PCF init, updateView, getOutputs and destroy lifecycle correctly and call notifyOutputChanged only for meaningful output changes.
  3. Deploy a versioned code app through the supported Power Platform workflow and share it with explicit app and data permissions.
  4. Keep declarative form logic in business rules when possible and use a client script only when complex supported custom behavior is required.

Explanation

Correct Answer

C:

Deploy a versioned code app through the supported Power Platform workflow and share it with explicit app and data permissions. This choice implements the controlling platform requirement rather than masking the symptom. Sharing an app does not automatically grant Dataverse table rights or connector access. Verify the change using: Inspect package version, environment, target app sharing, connection references, managed solution components and postdeploy tests.

Incorrect Answers

A:

Use Power Apps Monitor and browser developer tools to reproduce request errors, isolate code failures and distinguish host from API issues. That action addresses Code app Monitor and browser troubleshooting instead. A failed HTTP call may be denied by authorization or an invalid query rather than an application crash. For this case, the targeted action is: Deploy a versioned code app through the supported Power Platform workflow and share it with explicit app and data permissions.

B:

Implement PCF init, updateView, getOutputs and destroy lifecycle correctly and call notifyOutputChanged only for meaningful output changes. That action addresses PCF lifecycle methods and output notification instead. An infinite update loop can occur when updateView unconditionally calls notifyOutputChanged. For this case, the targeted action is: Deploy a versioned code app through the supported Power Platform workflow and share it with explicit app and data permissions.

D:

Keep declarative form logic in business rules when possible and use a client script only when complex supported custom behavior is required. That action addresses Form business rule versus custom client JavaScript instead. Client-only rules cannot guarantee integrity for SDK/API writes; a complex callback may also increase form latency. For this case, the targeted action is: Deploy a versioned code app through the supported Power Platform workflow and share it with explicit app and data permissions.

Question 130

An embedded agent suggests changing a customer's credit limit and the code app automatically executes it without consent. Which Power Platform extension or architecture change BEST addresses the core requirement?

  1. Pass the execution context to registered form handlers and obtain formContext instead of relying on deprecated global Xrm.Page.
  2. Invoke a solution-managed cloud flow from a code app with well-defined input/output schemas and bounded timeout/error handling.
  3. Use asynchronous Xrm.WebApi.retrieveMultipleRecords with encoded OData queries, selected columns, paging and proper error handling.
  4. Connect a code app to an authorized Copilot Studio agent through a supported client interface while validating user consent and action permissions.

Explanation

Correct Answer

D:

Connect a code app to an authorized Copilot Studio agent through a supported client interface while validating user consent and action permissions. This choice implements the controlling platform requirement rather than masking the symptom. Agent output is untrusted user-facing content; it cannot override application authorization or approval. Verify the change using: Inspect agent ID, environment, session, identity, permitted tools, response handling and escalation flow.

Incorrect Answers

A:

Pass the execution context to registered form handlers and obtain formContext instead of relying on deprecated global Xrm.Page. That action addresses Model-driven formContext from execution context instead. The Client API formContext comes from the event context; standalone Web API calls do not expose a form object. For this case, the targeted action is: Connect a code app to an authorized Copilot Studio agent through a supported client interface while validating user consent and action permissions.

B:

Invoke a solution-managed cloud flow from a code app with well-defined input/output schemas and bounded timeout/error handling. That action addresses Code app use of Power Automate cloud flow instead. Calling a flow asynchronously does not guarantee its downstream actions committed before a UI success toast. For this case, the targeted action is: Connect a code app to an authorized Copilot Studio agent through a supported client interface while validating user consent and action permissions.

C:

Use asynchronous Xrm.WebApi.retrieveMultipleRecords with encoded OData queries, selected columns, paging and proper error handling. That action addresses Dataverse Xrm.WebApi asynchronous lookups instead. Client API Web API operations are asynchronous and respect Dataverse security; querying every field is inefficient. For this case, the targeted action is: Connect a code app to an authorized Copilot Studio agent through a supported client interface while validating user consent and action permissions.

Microsoft Power Platform Developer (PL-400) Practice Tests