Users' queries may fail with an error message in Microsoft 365 Copilot Chat

Title: Users' queries may fail with an error message in Microsoft 365 Copilot Chat User impact: Users' queries may have failed with an error in Copilot Chat. More info: Users may have seen the following error message: "Sorry, something went wrong. Service unavailable. Please try again." Final status: We've completed the service instance restarts across the final portions of the impacted environment and verified through internal telemetry that impact is fully remediated. Scope of impact: Any user attempting to run queries in Copilot Chat may have experienced failures in completing the action. Start time: Thursday, April 2, 2026, at 12:00 PM UTC End time: Friday, April 3, 2026, at 3:18 AM UTC Root cause: A configuration service utilized in the flow of completing this operation fell below optimal operating thresholds, resulting in impact. Next steps: - We're continuing to monitor the affected service flow closely to gain further insight into the source of the underlying issue and identify ways we can better prevent similar impact in the future. This is the final update for the event.

Title: Users' queries may fail with an error message in Microsoft 365 Copilot Chat User impact: Users' queries may fail with an error in Copilot Chat. More info: Users may see the following error message: "Sorry, something went wrong. Service unavailable. Please try again." Current status: We're finalizing the process of restarting service instances throughout the remaining affected service environment for full remediation and anticipate the last of the restarts may take effect by our next scheduled communications update, at which point we'll confirm through telemetry whether impact is fully resolved. Scope of impact: Any user attempting to run queries in Copilot Chat may experience failures in completing the action. Start time: Thursday, April 2, 2026, at 12:00 PM UTC Root cause: A configuration service utilized in the flow of completing this operation has fallen below optimal operating thresholds, resulting in impact. Next update by: Friday, April 3, 2026, at 5:00 AM UTC

Title: Users' queries may fail with an error message in Microsoft 365 Copilot Chat User impact: Users' queries may fail with an error in Copilot Chat. More info: Users may see the following error message: "Sorry, something went wrong. Service unavailable. Please try again." Current status: We've manually restarted the service in the majority of affected regions and have confirmed through service health telemetry that recovery has started for those regions. However, we're monitoring the remaining impacted regions' recoveries and applying additional restarts as needed to achieve full remediation, which is taking more time to complete than originally anticipated. We'll provide details on our timeline for complete mitigation as soon as they become available. Scope of impact: Any user attempting to run queries in Copilot Chat may experience failures in completing the action. Start time: Thursday, April 2, 2026, at 12:00 PM UTC Root cause: A configuration service utilized in the flow of completing this operation has fallen below optimal operating thresholds, resulting in impact. Next update by: Friday, April 3, 2026, at 3:00 AM UTC

Title: Users' queries may fail with an error message in Microsoft 365 Copilot Chat User impact: Users' queries may fail with an error in Copilot Chat. More info: Users may see the following error message: "Sorry, something went wrong. Service unavailable. Please try again." Current status: We've confirmed that manually restarting the affected infrastructure achieves mitigation and are manually applying this mitigation to all affected regions. We anticipate that this restart will be completed by our next scheduled update, resolving the event. Scope of impact: Any user attempting to run queries in Copilot Chat may experience failures in completing the action. Start time: Thursday, April 2, 2026, at 12:00 PM UTC Root cause: A configuration service utilized in the flow of completing this operation has fallen below optimal operating thresholds, resulting in impact. Next update by: Friday, April 3, 2026, at 1:00 AM UTC

Title: Users' queries may fail with an error message in Microsoft 365 Copilot Chat User impact: Users' queries may fail with an error in Copilot Chat. More info: Users may see the following error message: "Sorry, something went wrong. Service unavailable. Please try again." Current status: We've successfully completed applying our manual mitigations to recover the performance of the responsible configuration service, however additional remediation steps are needed to resolve this impact to Copilot Chat queries. We're manually restarting a subset of the affected infrastructure to confirm that this action will achieve resolution before applying this fix to all affected environments.  Scope of impact: Any user attempting to run queries in Copilot Chat may experience failures in completing the action.  Start time: Thursday, April 2, 2026, at 12:00 PM UTC Root cause: A configuration service utilized in the flow of completing this operation has fallen below optimal operating thresholds, resulting in impact. Next update by: Thursday, April 2, 2026, at 11:00 PM UTC

Title: Users' queries may fail with an error message in Microsoft 365 Copilot Chat User impact: Users' queries may fail with an error in Copilot Chat. More info: Users may see the following error message: "Sorry, something went wrong. Service unavailable. Please try again." Current status: We've confirmed that a configuration service utilized in the flow of completing this operation has fallen below optimal operating thresholds, resulting in impact. We're applying manual mitigations to adjust capacity and traffic to restore this operation.  Scope of impact: Any user attempting to run queries in Copilot Chat may experience failures in completing the action. Start time: Thursday, April 2, 2026, at 12:00 PM UTC Root cause: A configuration service utilized in the flow of completing this operation has fallen below optimal operating thresholds, resulting in impact. Next update by: Thursday, April 2, 2026, at 9:00 PM UTC

Title: Users' queries may fail with an error message in Microsoft 365 Copilot Chat User impact: Users' queries may fail with an error in Copilot Chat. More info: Users may see the following error message: "Sorry, something went wrong. Service unavailable. Please try again." Current status: We're reviewing the service side logs related to this event to determine whether it's correlated to an ongoing incident in order to develop remediation steps to address the issue expediently. Scope of impact: Any user attempting to run queries in Copilot Chat may experience failures in completing the action. Start time: Thursday, April 2, 2026, at 12:00 PM UTC Next update by: Thursday, April 2, 2026, at 7:00 PM UTC

Title: We're looking into a potential problem impacting Microsoft 365 Copilot Chat User impact: We're checking for potential impact to your users. Current status: We're investigating a potential issue impacting Microsoft 365 Copilot Chat and checking for impact to your organization. We'll provide an update within 30 minutes.