Microsoft 365 Alert – Service Degradation – Microsoft Copilot (Microsoft 365) – Users may not see results or experience delays using Microsoft Copilot (Microsoft 365) or Copilot Chat – RESOLVED

Announcements Arpan Das

14/11/2025 08:45:00 AM

NHSmail Reference: INC46683008

Microsoft Reference: CP1186191

Issue Status: RESOLVED

Issue Description: Users may not see results or experience delays using Microsoft Copilot (Microsoft 365) or Copilot Chat

More info: Users may be missing results or experience delays when using Copilot Search or Copilot Chat.

Final Update: 17/11/2025 08:54:00 AM – Microsoft have confirmed through monitoring service health telemetry that the performance optimizations they have implemented have remediated the impact.

Scope of impact: Any user attempting to use Copilot Search or Copilot chat may be impacted.

Root cause: A recent service change that increased request traffic to the portion of infrastructure responsible for facilitating Copilot search and Copilot chat is preventing it from efficiently handling requests and is causing impact.

Next Steps: Microsoft are reviewing their update procedures to understand why impact to Copilot Search and Copilot Chat wasn’t caught during the testing phase. This will allow us to drive service improvements by proactively identifying similar issues in the future and improve their update testing processes.