【トラブルシューティング】”Microsoft 365″ や “Microsoft 365 Copilot” へアクセスの行えないインシデントが発生
- 2025/12/18
- 👁 48 PV
Microsoft が提供する法人向け “Microsoft 365” のサービスにて、インシデント “MO1198797（Users in Japan and China are experiencing access and sign‑in issues with Microsoft 365 and Microsoft Copilot）” が発生していることを明らかにしています。
本インシデントの影響を受けている日本および中国、マレーシア国内のユーザーは、“Microsoft 365” や “Microsoft 365 Copilot” へのアクセスが期待どおりに行えない可能性があります。
なお、現在は緩和策を講じたことにより事象が改善している可能性があります。
Users in Japan and China are experiencing access and sign‑in issues with Microsoft 365 and Microsoft Copilot – MO1198797
ID
MO1198797
影響を受けているサービス
Microsoft 365 Suite
Final Status
Resolved
種類
Incident
Start Time
2025 年 12 月 18 日 9：00 JST
End Time
2025 年 12 月 18 日 10：17 JST
User Impact
Users in Japan and China may have been experiencing access and sign‑in issues with Microsoft 365 and Microsoft Copilot.
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.
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.
2025 年 12 月 18 日 12：28 JST
Title
Users in Japan and China may be experiencing access and sign‑in issues with Microsoft 365 and Microsoft Copilot
User Impact
Users in Japan and China may have been 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
2025 年 12 月 18 日木曜日 9：00 JST
End time
2025 年 12 月 18 日木曜日 10：17 JST
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.
2025 年 12 月 18 日 11：53 JST
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 are experiencing access and sign‑in issues with Microsoft 365 and Microsoft Copilot.
Current Status
The service health remains stable and users should now be experiencing improved access to Microsoft 365 and Copilot services. We’re continuing to monitor for an extended period to ensure complete service recovery.
Scope of Impact
- Your organization may be affected by this event, and some users in Japan, China, and Malaysia who are attempting to access Microsoft 365 services including Copilot may be impacted.
- This information may be updated as our investigation continues.
Start time
2025 年 12 月 18 日木曜日 9：00 JST
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 update by
2025年12月18日木曜日 13:00 JST
2025 年 12 月 18 日 11：39 JST – クイック更新
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 are experiencing access and sign‑in issues with Microsoft 365 and Microsoft Copilot.
Current Status
- We’ve confirmed that service telemetry is showing a positive recovery following the applied mitigation.
- We’ll continue to monitor closely to confirm complete restoration.
Scope of Impact
Your organization may be affected by this event, and some users in Japan, China, and Malaysia who are attempting to access Microsoft 365 services including Copilot may be impacted. This information may be updated as our investigation continues.
Start time
2025 年 12 月 18 日木曜日 9：00 JST
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 update by
2025 年 12 月 18 日木曜日 12：00 JST
2025 年 12 月 18 日 10：34 JST – クイック更新
Current status
- We’ve identified that a portion of service infrastructure, supporting user traffic in Japan, became impacted at approximately 12:00 AM UTC due to a routing issue.
- We’ve taken mitigating actions to rebalance the traffic across healthy infrastructure to restore availability.
- We’re working to confirm full recovery.
- This quick update is designed to give the latest information on this issue.
2025年12月18日 10:13 JST
Title
Users in the Japan region are currently experiencing access and sign‑in issues with Microsoft 365 and Microsoft Copilot
User Impact
Users in the Japan region are currently experiencing access and sign‑in issues with Microsoft 365 and Microsoft Copilot.
Current Status
We’re actively reviewing service telemetry to identify the underlying cause of the issue and determine appropriate mitigation actions.
Scope of Impact
Your organization may be affected by this event, and some users attempting to access Microsoft 365 services including Copilot may be impacted.
Next update by
2025 年 12 月 18 日木曜日 11：00 JST
2025年12月18日 9:50 JST
Title
Investigating user reports of Microsoft 365 Services and Microsoft Copilot issues in Japan
User Impact
- We don’t have detail on impact yet.
- We’re seeing an increase in user reported issues above our alerting threshold.
Current Status
We are reviewing service telemetry and available information to determine if there is an issue happening and we’ll update this message shortly with our latest findings.
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関連リンク
- ・Microsoft 365 Copilot | 職場向けの AI 仕事効率化ツール：https://www.microsoft.com/ja-jp/microsoft-365-copilot
- ・Microsoft 365 Business Products | Microsoft 365：https://www.microsoft.com/ja-jp/microsoft-365
- ・Microsoft – AI、クラウド、生産性向上、コンピューティング、ゲーム、アプリ：https://www.microsoft.com/ja-jp/
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