Microsoft 365 Alert – Service Degradation – Microsoft 365 Copilot Chat – Some users may have been unable to receive responses when using Microsoft 365 Copilot Chat – RESOLVED

25/08/2026 01:51:00 PM

NHS.net Connect Reference: INC46918732

Microsoft Reference: CW1461372

Issue Status: RESOLVED

Issue Description: Users may have been unable to receive responses when using Copilot Chat.

More info: Affected users may have received error messages stating that a problem had occurred or that Copilot could not respond.

Final Update: 25/08/2026 01:52:00 PM – Microsoft has completed reverting the change that inadvertently led to impact. Upon completing a period of monitoring, they have determined service availability has returned to normal, and the issue is resolved.

Scope of impact: This issue may have impacted any user attempting to use Copilot Chat.

Root cause: A recent change designed to support metered access for certain scenarios did not deliver the expected outcome, inadvertently resulting in impact.

Next steps: Microsoft is reviewing their internal change management processes and controls to identify opportunities for improvement and strengthen their safeguards around future changes.

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