Microsoft365 - Some users may be unable to access Office.com or the Microsoft 365 Copilot web sign‑in page

Status - RESOLVED- After an extended period of monitoring, Microsoft have confirmed that this incident has not reoccurred.

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.

Steps to prevent reoccurrence: - Microsoft are reviewing performance data and trends on the affected infrastructure to help prevent similar impact from happening again.

Users are experiencing login issues with m365.cloud.microsoft and www.office.com. Microsoft has made configuration changes and is monitoring the service to resolve the problem.

Users who are logged in already are not affected. Users should use desktop apps for Outlook or Teams if impacted by this incident.