Users in Japan and China are experiencing access and sign‑in issues with Microsoft 365 and Microsoft Copilot
ID: MO1198797
Issue type: Incident
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Impacted services
Microsoft 365 suite
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Details
Title: Users in Japan and China are experiencing access and sign‑in issues with Microsoft 365 and Microsoft Copilot
User impact: Users in Japan and China were experiencing access and sign‑in issues with Microsoft 365 and Microsoft Copilot.
Final status: We’ve confirmed that the issue has been resolved, and all services are now operating as expected.
Scope of impact: Your organization may have been affected by this event, and some users in Japan, China, and Malaysia who attempted to access Microsoft 365 services including Copilot may have been impacted.
Start time: Thursday, December 18, 2025, at 12:00 AM UTC
End time: Thursday, December 18, 2025, at 1:17 AM UTC
Preliminary root cause: A traffic routing issue caused infrastructure in Japan to become unhealthy, which ultimately blocked users from successfully connecting to Microsoft 365 and Copilot services.
Next steps:
- We’re evaluating our network traffic routing flows to improve overall performance and help reduce future service disruptions.
We'll provide a preliminary Post-Incident Report within two business days and a final Post-Incident Report within five business days.
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