Microsoft 365 Alert – Service Degradation – Microsoft 365 Copilot Chat– Users may have been unable to save their personalization settings within Microsoft Copilot Chat and encountered an error – RESOLVED

Announcements Arpan Das

30/01/2026 08:50:00 AM

NHSmail Reference: INC46780506

Microsoft Reference: CW1255304

Issue Status: RESOLVED

Issue Description: Users may have been unable to save their personalization settings within Microsoft Copilot Chat and encountered an error.

More info: Affected users may have seen a banner stating, “Something went wrong, and we couldn’t save your changes. Try refreshing the page.”

Final Update: 24/03/2026 08:33:00 AM–Microsoft’s fix completed saturating the affected environments on Friday, March 20, 2026, at 11:30 PM UTC, and after an extended period of monitoring, they can confirm the issue is resolved.

Scope of impact: All users attempting to save preferences within the Microsoft Copilot Chat settings page may have been affected.

Root cause: The API that facilitates settings saving was set to a prior, deprecated version of the Copilot model.

Next Steps: Microsoft help prevent similar impacts in the future, they are further reviewing their testing and validation processes prior to deployment.