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How to Show a Power Automate Checklist on Microsoft Planner Task Cards

Khadija Khan Oct 9, 2026 869 views

Question details

The user needs the checklist generated by a Power Automate flow to appear correctly on weekly Microsoft Planner task cards without HTTP URI errors.

How to Show a Power Automate Checklist on Microsoft Planner Task Cards

Product: Microsoft Power Automate and Microsoft Planner
Device & OS: not provided
Scenario: Automating weekly task creation in Microsoft Planner with predefined checklists.
Observed behavior: The predefined checklist fails to display correctly on the task card, and HTTP request URI attempts result in errors.

Before you start

Ensure you have adequate permissions to create and modify tasks within the target Microsoft Planner plan, and verify that your Power Automate account has access to the Microsoft Graph API if you are using custom HTTP requests.

Solution 1Recommended

Verify Planner HTTP Request URI and Checklist JSON Structure

The most common reason checklists fail to show is an incorrect HTTP URI or improperly formatted JSON payload in the "Update Task Details" action.

To properly inject and display a checklist on a Planner task card using Power Automate, the JSON structure must strictly align with the Microsoft Graph API requirements. A simple string array will fail.

Verify the Task ID mapping

Ensure you are passing the dynamically generated Task ID from the initial 'Create a task' step directly into the 'Update task details' step.

Validate the checklist JSON structure

Verify that your checklist payload matches the Graph API schema. Each checklist item must be an object containing a unique ID (such as a generated GUID), a 'title' string, and an 'isChecked' boolean value.

Check the API endpoint URI

If you are using an HTTP request, ensure the URI points to the correct Graph API endpoint: https://graph.microsoft.com/v1.0/planner/tasks/{task-id}/details.

Set the appropriate Headers

Confirm the 'If-Match' header is included in your HTTP request and set to the correct ETag value obtained from a prior 'Get Task Details' step to prevent versioning conflicts.

Verify Planner HTTP Request URI and Checklist JSON Structure

Checklist Display Setting: To force the checklist to show on the front of the Planner card face automatically, you must update the 'previewType' property of the task to 'checklist' via a separate Graph API PATCH request.

Solution 2

Consult the Microsoft Power Automate Community

If errors persist after verifying the API structure, sharing your sanitized flow design with experts can help identify niche HTTP request issues.

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Frequently Asked Questions

Why does my Power Automate checklist item show as a string instead of a clickable checklist?

This usually happens if the JSON array is passed as a single string variable without being properly parsed. Ensure you build a proper JSON array using the 'Select' or 'Compose' data operation actions before passing it to the Planner action.

Can I set the checklist to show on the Planner card by default using standard connectors?

The standard 'Update task details' connector in Power Automate does not currently have a direct toggle for 'Show on card'. To achieve this, you must use a premium 'Send an HTTP request' action targeting the Microsoft Graph API to modify the previewType property.

Is there a limit to how many checklist items I can add to a Planner task via Power Automate?

Yes, Microsoft Planner currently restricts task checklists to a maximum of 20 items per individual task. Ensure your automated flow does not exceed this limit, otherwise the API request will fail.

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