Some users may have been unable to access Office.com or the Microsoft 365 Copilot web sign‑in page
ID: MO1254319
Issue type: Incident
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Impacted services
Microsoft 365 suite
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Details
Title: Some users may have been 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: Users could've accessed 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
As a workaround, users may have been able to leverage https://m365.cloud.microsoft/search to sign in using this page. Once signed in, users could've accessed Office.com.
Final status: We've concluded our extended period of monitoring and confirmed impact has not reoccurred.
Scope of impact: Impact was specific to some users who were served through the affected infrastructure.
Start time: Tuesday, March 17, 2026, at 11:42 AM UTC
End time: Tuesday, March 17, 2026, at 4:05 PM UTC
Root cause: The infrastructure that supports access to Office.com and the Microsoft 365 Copilot web sign-in page was receiving a high volume of traffic that inhibited the rate at which some users' requests were being processed, preventing some users from accessing the service pages.
Next steps:
- We're reviewing performance data and trends on the affected infrastructure to help prevent similar impact from happening again.
- We're monitoring service telemetry to ensure impact does not reoccur.
This is the final update for the event.
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