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Fix Planner Attachments Not Opening in Microsoft Mobile App
Question details
Users are unable to open attachments in the Microsoft Planner mobile app after a Microsoft 365 group migration.
- Product
- Microsoft Planner
- Device & OS
- Mobile
- Scenario
- Attempting to access task attachments via the mobile app after completing a Microsoft 365 group migration.
- Observed behavior
- Attachments open successfully on the desktop version of Planner but remain indefinitely stuck on a loading screen in the mobile app.
Ensure your mobile device has a stable internet connection and try clearing the Planner app cache before proceeding with advanced troubleshooting.
Contact Your IT Admin to Open a Microsoft Support Ticket
Because this error involves backend permissions across Microsoft 365 groups, SharePoint, and Planner, it requires investigation by Microsoft Support.
When Microsoft 365 groups are migrated, file permission structures in the underlying SharePoint backend can sometimes fail to sync properly with mobile endpoints. End-users cannot fix this configuration mismatch natively from the app.
Reach out to your company's IT department or the individual designated as your Microsoft 365 tenant administrator.
Ask the administrator to log into the Microsoft 365 Admin Center using their admin credentials.
In the left-hand navigation pane, the admin should click on 'Support' and then select 'New service request' to open a ticket detailing the mobile attachment syncing bug.
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Frequently Asked Questions
Why do Planner attachments open on desktop but get stuck on mobile?
This typically occurs after a group migration because the backend SharePoint permissions take longer to propagate to mobile endpoints, or the mobile app's authentication token fails to refresh correctly for the newly migrated group.
Can I fix this issue without involving my IT administrator?
You can try signing out of the Planner mobile app, clearing the app data, and signing back in. However, if the issue is rooted in the Microsoft 365 migration process, only an administrator can request the necessary backend fix from Microsoft.
How can I access my task files on mobile while waiting for Microsoft to fix it?
As a workaround, you can log into Planner through your mobile web browser, or open the SharePoint mobile app and navigate directly to the document library associated with your Planner group to view the files.
