Some users may be unable to access the Microsoft 365 web sign-in page and the Microsoft 365 Copilot web sign‑in page
ID: MO1268972
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 the Microsoft 365 web sign-in page and the Microsoft 365 Copilot web sign‑in page
User impact: Users may have been unable to access the Microsoft 365 web sign-in page and the Microsoft 365 Copilot web sign‑in page.
More info: Users couldn't access Microsoft Copilot through application-based Microsoft Copilot services. This included, but was not limited to:
- Microsoft Copilot desktop app
- Copilot in Microsoft Teams
- Copilot in Office apps
Users may have been able to leverage https://m365.cloud.microsoft/search, and should been able to sign in using this page. Once signed in, users could access Office.com.
Final status: We monitored our telemetry after implementing our configuration changes and confirmed that the impact was remediated.
Scope of impact: Impact was specific to users who were attempting to access the Microsoft 365 web sign-in page and the Microsoft 365 Copilot web sign‑in page.
Start time: Thursday, April 2, 2026, at 8:40 PM UTC
End time: Friday, April 3, 2026, at 12:55 AM UTC
Root cause: The infrastructure that supports access to Microsoft 365 web sign-in page and the Microsoft 365 Copilot web sign-in page was not processing traffic efficiently, which prevented some users from accessing the service pages.
Next steps:
- We're reviewing performance data and trends on the affected infrastructure to help develop improved preventative measures to avoid similar impact in the future.
This is the final update for the event.
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