Microsoft 365 Alert – Service Degradation – Planner – Users may have encountered issues accessing features in the Microsoft Planner application – RESOLVED

08/05/2026 16:51:00 PM

NHSmail Reference: INC46833190

Microsoft Reference: PL1317706

Issue Status: RESOLVED

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

Current Update: 22/05/2026 11:59:00 AM – 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.

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: Microsoft are continuing to investigate the root cause of the authorization path issue to help prevent future recurrences.