Microsoft 365 Alert – Service Degradation – Microsoft 365 suite – Some users may be unable to access the Microsoft 365 web sign-in page and the Microsoft 365 Copilot web sign in page – RESOLVED

03/02/2026 9:02:00 AM

NHSmail Reference: INC46790270

Microsoft Reference: MO1268972

Issue Status: RESOLVED

Issue Description: Some 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 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 Update: 03/02/2026 9:02:00 AM– Microsoft has 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.

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: Microsoft are reviewing performance data and trends on the affected infrastructure to help develop improved preventative measures to avoid similar impact in the future.