Microsoft 365 Alert – Service Degradation – Microsoft Copilot (Microsoft 365) – Users may be unable to use Microsoft 365 Copilot – RESOLVED

Announcements Shagufta Naaz

01/06/2026 09:09:00 AM

NHSmail Reference: INC46838704

Microsoft Reference: CP1326225

Issue Status: RESOLVED

Issue Description: Users may be unable to use Microsoft 365 Copilot.

More info: Users received errors when attempting to interact with Microsoft 365 Copilot.

This issue affected Copilot experiences across all Microsoft 365 productivity apps and services.

Final Update: 01/06/2026 09:09:00 AM – After a period of extended monitoring, Microsoft has validated that service has been restored.

Scope of impact: This issue could have impacted any user who attempted to use Microsoft 365 Copilot.

Root cause: An increase in retry traffic within the infrastructure responsible for Copilot LLM API use prevented users from accessing Microsoft 365 Copilot.

Next update by: Microsoft are investigating the source of the increase in retries within the affected infrastructure to better understand the circumstances that caused this problem.

They will provide a preliminary Post-Incident Report within two business days and a final Post-Incident Report within five business days