Microsoft 365 Alert – Service Degradation – Microsoft Copilot (Microsoft 365 – Some users may intermittently be unable to complete Microsoft 365 Copilot requests or receive responses – RESOLVED

03/06/2026 09:01:00 AM

NHSmail Reference: INC46841346

Microsoft Reference: CP1332783

Issue Status: RESOLVED

Issue Description: Some users may intermittently be unable to complete Microsoft 365 Copilot requests or receive responses.

Final Update: 03/06/2026 09:01:00 AM –Microsoft has identified that a recent service change introduced a configuration issue within a portion of the GPT-5.3 chat infrastructure, resulting in intermittent failures when processing Microsoft 365 Copilot requests and generating responses. To remediate this issue, they have developed and applied a configuration fix to the affected infrastructure, and after monitoring the service, they have verified that this action has successfully resolved the problem.

Scope of impact: Impact may have occurred for a subset of users who were intermittently unable to complete Microsoft 365 Copilot requests or receive responses.

Root cause: A recent service change introduced a configuration issue within a portion of the GPT-5.3 chat infrastructure, resulting in intermittent failures when processing Microsoft 365 Copilot requests and generating responses.

Next update by: Microsoft are investigating how the recent service change introduced a configuration issue within a portion of the GPT-5.3 chat infrastructure to prevent this problem from happening again through improvements in our service change testing and validation phases.