Some users may encounter issues accessing features in the Microsoft Planner application

Title: Some users may encounter issues accessing features in the Microsoft Planner application User impact: Users may have encountered issues accessing features in the Microsoft Planner application. Final status: Service-side telemetry confirms the mitigation steps taken have been successful and restored access to the Microsoft Planner application. Scope of impact: Some users attempting to access features in the Microsoft Planner app may have been impacted. Start time: Thursday, May 21, 2026, at 7:25 AM UTC End time: Thursday, May 21, 2026, at 5:17 PM UTC Root cause: An authorization path issue caused an increase in cache usage resulting in the service becoming unhealthy and issues accessing the Microsoft Planner application. Next steps: We're continuing to investigate the root cause of the authorization path issue to help prevent future recurrences. This is the final update for this communication.

Title: Some users may encounter issues accessing features in the Microsoft Planner application User impact: Users may encounter issues accessing features in the Microsoft Planner application. Current status: We’ve deployed targeted mitigation actions to reduce the impact, increasing the time between background data refreshes and extending caching durations for Microsoft Planner. Service-side telemetry shows improvements from these changes, and we continue working on additional steps to further stabilize the experience while the root cause investigation progresses. Scope of impact: Some users attempting to access features in the Microsoft Planner app may be impacted. Next update by: Thursday, May 21, 2026, at 5:30 PM UTC

Title: Some users may encounter issues accessing features in the Microsoft Planner application User impact: Users may encounter issues accessing features in the Microsoft Planner application. Current status: We're investigating an issue with some users that may be encountering intermittent degradation when accessing Microsoft Planner features, and analyzing service telemetry to help us identify the root cause and the next steps required to mitigate impact. Scope of impact: Impact is specific to some users attempting to access features in the Microsoft Planner application. Next update by: Thursday, May 21, 2026, at 3:30 PM UTC