Some users may be unable to receive responses when using Microsoft 365 Copilot Chat

A post-incident report has been published.

A post-incident report has been published.

A post-incident report has been published.

Title: Some users may have been unable to receive responses when using Microsoft 365 Copilot Chat User impact: 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 status: We've completed reverting the change that inadvertently led to impact. Upon completing a period of monitoring, we've 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. Start time: Monday, August 24, 2026, at 10:50 PM UTC End time: Tuesday, August 25, 2026, at 10:20 AM UTC Preliminary 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: - We are reviewing our internal change management processes and controls to identify opportunities for improvement, and strengthen our safeguards around future changes. We'll provide a preliminary Post-Incident Report within two business days and a final Post-Incident Report within five business days.

The roll back of the suspected change is continuing as expected. Early indications continue to show an improvement in service availability and we've received some reports from previously affected customers that the issue is resolved. We're continuing to monitor this rollback process closely to ensure a complete resolution is achieved. Next update by: Tuesday, August 25, 2026, at 12:30 PM UTC This quick update is designed to give the latest information on this issue.

Title: Some users may be unable to receive responses when using Microsoft 365 Copilot Chat User impact: Users may be unable to receive responses when using Copilot Chat. More info: Affected users may receive error messages stating that a problem has occurred or that Copilot could not respond. Current status: We've reverted the suspected change and are observing signs of recovery in service telemetry. We're engaging a sample of affected users to validate whether this action has successfully mitigated the issue and restored Chat functionality. Scope of impact: This issue may impact any user attempting to use Copilot Chat. This information may be updated as our investigation continues. Next update by: Tuesday, August 25, 2026, at 12:30 PM UTC

Title: Some users may be unable to receive responses when using Microsoft 365 Copilot Chat User impact: Users may be unable to receive responses when using Copilot Chat. More info: Affected users may receive error messages stating that a problem has occurred or that Copilot could not respond. Current status: We've identified a recent service update that may be contributing to impact. We're continuing to analyze service telemetry and diagnostic data to validate this correlation while evaluating mitigation actions to reduce impact and restore Chat functionality. Scope of impact: This issue may impact any user attempting to use Copilot Chat. This information may be updated as our investigation continues. Next update by: Tuesday, August 25, 2026, at 12:00 PM UTC

Title: Some users may be unable to receive responses when using Microsoft 365 Copilot Chat User impact: Users may be unable to receive responses when using Copilot Chat. More info: Affected users may receive error messages stating that a problem has occurred or that Copilot could not respond. Current status: We've received reports indicating an issue with Copilot Chat where some users may be unable to receive responses to prompts. We're reviewing service monitoring telemetry to isolate the root cause and determine our next troubleshooting steps. Scope of impact: Your organization is affected by this event, and some users attempting to use Copilot Chat may be impacted. This information may be updated as our investigation continues. Next update by: Tuesday, August 25, 2026, at 10:30 AM UTC