Some users may be unable to view the Planner app in Microsoft Teams
ID: TM1261085
Issue type: Incident
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Impacted services
Microsoft Teams
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Details
Title: Some users may be unable to view the Planner app in Microsoft Teams
User impact: Users were unable to view the Planner app in Microsoft Teams.
More info: As a way to enforce the efficiency of our fix, we recommend users to restart Microsoft Teams. If Planner still does not load after restarting Teams, we still recommend admins update the Planner assignment setting from "No one" to "Everyone" in the Microsoft Teams admin center (TAC) after clearing the cache and resetting sign in. Affected users can also use the Planner app web client, if they have access to it, to bypass impact.
Final status: We’ve confirmed the fix rollout has completed successfully, and customer validation indicates the issue is resolved.
Scope of impact: Impact was specific to some users who were served through the affected infrastructure attempting to utilize the Planner app in Microsoft Teams.
Start time: Wednesday, March 25, 2026, at 3:38 AM UTC
End time: Thursday, March 26, 2026, at 2:00 AM UTC
Root cause: The Planner app contained an incorrectly configured app definition value that resulted in an unintended change to the Planner app’s classification.
Next steps:
- We’re analyzing the affected infrastructure to identify opportunities for improvement that help prevent this issue from recurring.
- We'll provide a preliminary Post-Incident Report within two business days and a final Post-Incident Report within five business days.
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