Fix Microsoft Planner Guest Users Cannot Save Card Updates
Question details
Guest users in Microsoft Planner are unable to save updates made to cards, with changes disappearing upon reopening the card.
- Product
- Microsoft Planner
- Device & OS
- not provided
- Scenario
- A guest user edits a task card in Microsoft Planner and expects the changes to be saved.
- Observed behavior
- The guest user can edit the card without seeing any error messages, but the changes are not saved and disappear completely when the card is reopened. Tenant users do not experience this issue.
Verify that the guest user has a stable internet connection and has been granted the necessary permissions to edit the specific Planner board by the plan owner.
Test in an InPrivate or Incognito Browser Window
Use a private browsing session to rule out cache, cookies, or extension conflicts that might be preventing the card updates from syncing.
Sometimes, outdated browser cache or conflicting browser extensions can interfere with the way Microsoft Planner communicates with the server, causing silent sync failures.
Launch your preferred web browser (such as Microsoft Edge or Google Chrome) and press Ctrl+Shift+N (Windows) or Cmd+Shift+N (Mac) to open an Incognito or InPrivate window.
Navigate to the Microsoft Planner website and log in using the guest user account credentials.
Edit the affected card, close it, and then reopen it to verify if the changes are successfully saved and retained.
Open a Microsoft 365 Support Ticket
If the issue persists for all guest users, a Microsoft 365 administrator must escalate the problem to Microsoft support for backend investigation.
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Frequently Asked Questions
Why are my changes in Microsoft Planner disappearing without an error?
This silent failure typically occurs due to browser cache conflicts blocking the server sync, or a backend tenant issue where guest user permissions are misconfigured in the Microsoft 365 environment. Testing in an Incognito window can help identify if it's a browser-related issue.
How do I generate HAR logs for Microsoft Support?
To generate HAR logs, open your browser, press F12 to open Developer Tools, and navigate to the Network tab. Check the 'Preserve log' option, reproduce the editing issue in Planner, right-click any item in the network list, and select 'Save all as HAR with content'.
Can guest users normally edit tasks in Microsoft Planner?
Yes, when an administrator or plan owner correctly configures guest access, guest users have the ability to view, create, edit, and delete tasks and cards within the shared Microsoft Planner board.
