Users in Japan, Asia and Australia may be unable to access Cowork in the Microsoft Copilot 365 User Interface (UI)

Timeline (UK time)

1. 6 Nov 2026, 05:05 GMT ✓ Operational

   Title: Users in Japan, Asia and Australia may be unable to access Cowork in the Microsoft Copilot 365 User Interface (UI) User impact: sers in Japan, Asia and Australia may have been unable to access Cowork in the Copilot UI. More info: When attempting to access Cowork, users in Japan, Australia, and Asia may have been redirected to Copilot Chat instead. Final status: We've confirmed through internal monitoring that our deployment has completed, and impact has been fully mitigated. Scope of impact: This issue may have affected any user in Japan, Australia, and Asia attempting to access Cowork. Start time: Thursday, November 5, 2026, at 4:30 PM UTC End time: Tuesday, November 10, 2026, at 1:14 AM UTC Root cause: A recent deployment introduced an issue where additional calls were delivered to multiple API endpoints, which caused our automated traffic management mechanisms to reduce request traffic flow which resulted in impact. Next steps: -We're reviewing our feature update testing and validation methods to better identify the potential for impact prior to deployment so we can prevent similar impact in the future, and improve our pre-deployment update testing processes. This is the final update for this event.

2. 6 Nov 2026, 03:51 GMT ✓ Operational

   Title: Users in Japan, Asia and Australia may be unable to access Cowork in the Microsoft Copilot 365 User Interface (UI) User impact: Users in Japan, Asia and Australia may be unable to access Cowork in the Copilot User Interface (UI). More info: When attempting to access Cowork, users in Japan, Australia, and Asia may be redirected to Copilot Chat instead. Current status: While we've confirmed that the deployment has completed for users in the Japan region, who are now able to access Cowork through the Copilot interface, we've identified that the deployment is still ongoing for users in Asia and Australia. We've updated the Title, User Impact, More Info and Scope of Impact sections to reflect this. We anticipate that the deployments in Asia and Australia will complete by the time of our next scheduled update. Scope of impact: This issue may affect any user in Japan, Australia, and Asia attempting to access Cowork. Root cause: A recent deployment introduced an issue where additional calls were delivered to multiple API endpoints, which caused our automated traffic management mechanisms to reduce request traffic flow which resulted in impact. Next update by: Friday, November 6, 2026, at 6:00 AM UTC

3. 6 Nov 2026, 03:28 GMT ✓ Operational

   Title: Users in Japan may be unable to access Cowork in the Microsoft Copilot 365 User Interface (UI) User impact: Users in Japan may be unable to access Cowork in the Microsoft Copilot 365 User Interface (UI). More info: When attempting to access Cowork, users in Japan may be redirected to Copilot Chat instead. Current status: We're continuing to monitor the progress of our deployment as we proceed through the final required steps for full remediation. Scope of impact: This issue may affect any user in Japan attempting to access Cowork. Root cause: A recent deployment introduced an issue where additional calls were delivered to multiple API endpoints, which caused our automated traffic management mechanisms to reduce request traffic flow which resulted in impact. Next update by: Friday, November 6, 2026, at 5:30 AM UTC

4. 6 Nov 2026, 02:11 GMT ✓ Operational

   Title: Users in Japan may be unable to access Cowork in the Microsoft Copilot 365 User Interface (UI) User impact: Users in Japan may be unable to access Cowork in the Copilot UI. More info: When attempting to access Cowork, users in Japan may be redirected to Copilot Chat instead. Current status: We've received information that indicates the impact associated with CP1540142 persists for users in Japan. After additional analysis, we're expediting the deployment of our code change which will turn off automatic traffic management mechanisms that reduced traffic flow and resulted in impact. Scope of impact: This issue may affect any user in Japan attempting to access Cowork. Start time: Thursday, November 5, 2026, at 4:30 PM UTC Root cause: A recent deployment introduced an issue where additional calls were delivered to multiple API endpoints, which caused our automated traffic management mechanisms to reduce request traffic flow which resulted in impact. Next update by: Friday, November 6, 2026, at 3:30 AM UTC