Users were unable to create or edit Ownerless Groups policies in Exchange Online

Title: Users were unable to create or edit Ownerless Groups policies in Exchange Online User impact: Users were unable to create or edit Ownerless Groups policies in Exchange Online. Final status: We’ve successfully developed and deployed the fix and after our validations have confirmed that impact is resolved. Scope of impact: Users attempting to create or update Ownerless Groups policies in Exchange Online were impacted. Start time: Thursday, February 12, 2026, at 3:33 PM UTC End time: Monday, March 16, 2026, at 6:30 AM UTC Root cause: A recent update to the authentication flow is caused the call to DSAPI to update Ownerless Groups policies to fail due to outdated authentication flow mapping, resulting in the impact. Next steps: - We're reviewing our update procedures to better identify similar issues during our development and testing cycles This is the final update for this event.

Title: Users may be unable to create or edit Ownerless Groups policies in Exchange Online User impact: Users may be unable to create or edit Ownerless Groups policies in Exchange Online. Final status: We’ve successfully developed and deployed the fix and after our validations have confirmed that impact is resolved. Scope of impact: Users attempting to create or update Ownerless Groups policies in Exchange Online were impacted. Start time: Thursday, February 12, 2026, at 3:33 PM UTC End time: Monday, March 16, 2026, at 6:30 AM UTC Root cause: A recent update to the authentication flow is caused the call to DSAPI to update Ownerless Groups policies to fail due to outdated authentication flow mapping, resulting in the impact. Next steps: - We're reviewing our update procedures to better identify similar issues during our development and testing cycles This is the final update for this event.

Title: Users may be unable to create or edit Ownerless Groups policies in Exchange Online User impact: Users may be unable to create or edit Ownerless Groups policies in Exchange Online. Current status: The fix deployment is ongoing, and we anticipate it will have completed by our next scheduled update. 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 update by: Monday, March 16, 2026, at 8:30 AM UTC

Title: Users may be unable to create or edit Ownerless Groups policies in Exchange Online User impact: Users may be unable to create or edit Ownerless Groups policies in Exchange Online. Current status: We've determined that a recent update to the authentication flow is causing the call to the Directory Services API (DSAPI) to update Ownerless Groups policies to fail due to outdated authentication flow mapping, resulting in the impact. We're deploying a solution to update the flow mapping for this call and we'll provide a timeline for remediation as one becomes available. 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 update by: Tuesday, March 10, 2026, at 7:30 AM UTC

Title: Users can't create or edit Ownerless Groups policies in Exchange Online User impact: Users can't create or edit Ownerless Groups policies in Exchange Online. Current status: We're investigating a potential issue with Exchange Online and checking for impact to your organization. We'll provide an update within 30 minutes.