Microsoft 365 Alert – Service Degradation – Microsoft Copilot (Microsoft 365) – Users may intermittently receive blank responses from Analyst Agent in Microsoft Copilot – ONGOING

22/05/2026 08:46:00 AM

NHSmail Reference: INC46833441

Microsoft Reference: CP1318025

Issue Status: ONGOING

Issue Description: Users may intermittently receive blank responses from Analyst Agent in Microsoft Copilot.

More info: Affected users can bypass impact by creating a new chat window within the Analyst Agent in Microsoft Copilot.

Current Update: 22/05/2026 08:46:00 AM– Though taking longer than previously anticipated due to the complexity of this issue, Microsoft are continuing their review of the service-side telemetry, along with analyzing recent service updates which may be contributing to impact so that they can refine our understanding of the underlying cause of impact.

Scope of impact: Some admins relying on security telemetry reporting in Microsoft Defender for Endpoint may be impacted. This information may be updated as our investigation continues.

Root cause: This event may impact any user utilizing the Analyst Agent in Microsoft Copilot, and any user might intermittently receive blank responses. This information may be updated as our investigation continues.

Next update by: Monday, May 25, 2026, at 10:00 PM UTC