Microsoft 365 Alert – Service Degradation – Microsoft Copilot (Microsoft 365 – Some users may encounter an error when using the Microsoft 365 Copilot rewrite feature in classic Outlook – ONGOING

Announcements Shagufta Naaz

12/06/2026 08:56:00 AM

NHSmail Reference: INC46849909

Microsoft Reference: CP1387482

Issue Status: ONGOING

Issue Description: Some users may encounter an error when using the Microsoft 365 Copilot rewrite feature in classic Outlook.

More info: Copilot rewrite feature functionality works as expected in Outlook on the web and new Outlook.

When affected users select text and use the Copilot rewrite option in classic Outlook, they may encounter the following error message, “Sorry, something went wrong. Copilot is working on it.”

Current Update: 12/06/2026 08:56:00 AM – Microsoft are working with a subset of affected users to collect additional logging and reproductions of impact to assist with debugging the issues and isolating potential regressions in affected Outlook client versions.

Scope of impact: Impact is specific to some users of the Copilot rewrite feature in classic Outlook.

Next update by: Friday, June 12, 2026, at 10:00 PM UTC