Microsoft 365 Alert – Service Degradation – Planner – Users attempting to utilize PLC may only see a link to Planner for access to associated plans, tasks, and management – RESOLVED

Announcements Arpan Das

18/09/2025 09:15:00 AM

NHSmail Reference: INC46632753

Microsoft Reference: PL1154805

Issue Status: RESOLVED

Issue Description: Users attempting to utilize PLC may only see a link to Planner for access to associated plans, tasks, and management.

More info: While PLC tasks lists are temporarily inaccessible in the native Loop experience, users can access their tasks lists through the link to Planner provided instead.

Final Update: 07/11/2025 07:52:00 AM – Microsoft have completed deployment of the fix to the affected environments and after monitoring the service, they have verified that that this action has successfully resolved the issue.

Scope of impact: Any user attempting to access PLC tasks lists through the To-Do or Planner Apps may be affected.

Root cause: A recent update to the authentication enforcement that some Planner component in Loop features rely on resulted in authentication failures, causing impact.

Next Steps: Microsoft are investigating how the update to authentication enforcement, which certain Planner components within Loop features relied on, resulted in authentication failures, to help prevent this problem from occurring again.