Microsoft 365 Alert – Service Degradation – Exchange Online – Users may be unable to create or edit Ownerless Groups policies in Exchange Online – RESOLVED

Announcements Shagufta Naaz

05/03/2026 10:02:00 AM

NHSmail Reference: INC46765268

Microsoft Reference: EX1243339

Issue Status: RESOLVED

Issue Description: Users may be unable to create or edit Ownerless Groups policies in Exchange Online.

Final Update: 16/03/2026 9:01:00 AM –Microsoft has successfully developed and deployed the fix and after their validations have confirmed that impact is resolved.

Scope of impact: Users attempting to create or update Ownerless Groups policies in Exchange Online may be impacted. This section may be updated as our investigation continues.

Root cause: A recent update to the authentication flow is causing the call to DSAPI to update Ownerless Groups policies to fail due to outdated authentication flow mapping, resulting in the impact.

Next Steps: Microsoft are reviewing their update procedures to better identify similar issues during our development and testing cycles