Some users may be unable to access Office.com or the Microsoft 365 Copilot web sign‑in page
ID: MO1253428
Issue type: Incident
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Impacted services
Microsoft 365 suite
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Details
Title: Some users may be unable to access Office.com or the Microsoft 365 Copilot web sign‑in page
User impact: Users may have been unable to access Office.com or the Microsoft 365 Copilot web sign‑in page.
More info: The impacted web-client was office.com, and impacted Microsoft 365 Copilot web-clients were office.com/chat, m365.cloud.microsoft, m365.cloud.microsoft/chat and copilot.cloud.microsoft.
Users could access Microsoft Copilot through application-based Microsoft Copilot services. This included but wasn't limited to:
- Microsoft Copilot desktop app
- Copilot in Microsoft Teams
- Copilot in Office apps
User may have been able to leverage office.com/search, which redirects to https://m365.cloud.microsoft/search, and should've been able to sign in using this page. Once signed in, users could access the impacted web-based office.com and Copilot clients.
Final status: We've confirmed through our service-side telemetry that that the service health has fully recovered and impact has been successfully remediated.
Scope of impact: Impact was specific to some users who were served through the affected infrastructure.
Start time: Monday, March 16, 2026, at 1:05 PM UTC
End time: Monday, March 16, 2026, at 9:55 PM UTC
Root cause: The infrastructure that supports access to Office.com and the Microsoft 365 Copilot web sign-in page received a high volume of traffic that inhibited the rate in which some users' requests were being processed, preventing some users from accessing the service pages.
Next steps:
- We're continuing to monitor the affected infrastructure closely to ensure the service remains stable and to help inform any changes we can make to improve the service's resilience against similar issues in the future.
This is the final update for the event.
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