Outage in Microsoft 365
Some users may be unable to access the Microsoft 365 web sign-in page and the Microsoft 365 Copilot web sign‑in page
Resolved Minor
April 02, 2026 - Started 21 days ago
- Lasted about 5 hours
Incident Report
Summary AI Generated
Some Microsoft 365 users were unable to access the Microsoft 365 web sign-in page and Microsoft 365 Copilot web sign-in page due to service infrastructure not processing traffic efficiently. The issue affected users served through specific infrastructure components, while application-based Copilot services remained accessible. Microsoft implemented configuration changes to address the inefficient traffic processing, with partial recovery observed after 5.3 hours.
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 be unable to access the Microsoft 365 web sign-in page and the Microsoft 365 Copilot web sign‑in page.
More info: Users can access Microsoft Copilot through application-based Microsoft Copilot services. This includes, but is not limited to:
- Microsoft Copilot desktop app
- Copilot in Microsoft Teams
- Copilot in Office apps
User may be able to leverage https://m365.cloud.microsoft/search, and should be able to sign in using this page. Once signed in, users can access Office.com.
Current status: We've identified that a section of service infrastructure is not processing traffic efficiently. We're making configuration changes to remediate impact.
Scope of impact: Impact is specific to some users who are served through the affected infrastructure.
Root cause: The infrastructure that supports access to the Microsoft 365 web sign-in page and the Microsoft 365 Copilot web sign-in page is not processing traffic efficiently, preventing some users from accessing the service pages.
Next update by: Friday, April 3, 2026, at 12:30 AM UTC
Components affected
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Latest Updates ( sorted recent to last )
21 days ago - at 04/03/2026 12:30AM
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 be unable to access the Microsoft 365 web sign-in page and the Microsoft 365 Copilot web sign‑in page.
More info: Users can access Microsoft Copilot through application-based Microsoft Copilot services. This includes, but is not limited to:
- Microsoft Copilot desktop app
- Copilot in Microsoft Teams
- Copilot in Office apps
User may be able to leverage https://m365.cloud.microsoft/search, and should be able to sign in using this page. Once signed in, users can access Office.com.
Current status: Since making our configuration changes, we've seen some recovery of the service infrastructure. We're evaluating whether the implementation of additional optimizations are needed for full recovery.
Scope of impact: Impact is specific to users who are 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
Root cause: The infrastructure that supports access to Microsoft 365 web sign-in page and the Microsoft 365 Copilot web sign-in page is not processing traffic efficiently, preventing some users from accessing the service pages.
Next update by: Friday, April 3, 2026, at 2:30 AM UTC
21 days ago - at 04/02/2026 10:58PM
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 be unable to access the Microsoft 365 web sign-in page and the Microsoft 365 Copilot web sign‑in page.
More info: Users can access Microsoft Copilot through application-based Microsoft Copilot services. This includes, but is not limited to:
- Microsoft Copilot desktop app
- Copilot in Microsoft Teams
- Copilot in Office apps
User may be able to leverage https://m365.cloud.microsoft/search, and should be able to sign in using this page. Once signed in, users can access Office.com.
Current status: We've identified that a section of service infrastructure is not processing traffic efficiently. We're making configuration changes to remediate impact.
Scope of impact: Impact is specific to some users who are served through the affected infrastructure.
Root cause: The infrastructure that supports access to the Microsoft 365 web sign-in page and the Microsoft 365 Copilot web sign-in page is not processing traffic efficiently, preventing some users from accessing the service pages.
Next update by: Friday, April 3, 2026, at 12:30 AM UTC
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