A significant service outage has disrupted Microsoft 365, preventing users from accessing key services, including the Admin Center and applications that depend on Microsoft Entra ID for authentication. The issue began on Thursday, October 9, 2025, and is impacting organizations worldwide.
Widespread Service Disruption
The outage has affected users attempting to log in to the Microsoft 365 Admin Center, along with other services that rely on Entra ID. Because Entra ID serves as a core authentication layer for Microsoft’s ecosystem, many essential tools, such as Outlook, Teams, and SharePoint, have become inaccessible for several users.
Microsoft acknowledged the issue and confirmed that its engineering teams are investigating user reports of login failures and service interruptions. The company’s initial investigation focused on identifying the failure point within dependent service pathways that connect Entra ID to the rest of the Microsoft 365 infrastructure.
Impact on IT Administrators
For IT administrators, this outage poses major operational challenges. The inability to access the Microsoft 365 Admin Center means administrators cannot perform critical management tasks, monitor system health, or resolve user-side issues. This has left many organizations unable to maintain normal workflow operations.
Root Cause: Azure Front Door (AFD) Failure
Microsoft’s investigation has traced the problem to a malfunction within Azure Front Door (AFD) — a global load-balancing and traffic management service used to route data efficiently to Microsoft’s cloud applications. The AFD issue has caused intermittent access failures across several admin portals and cloud-based systems.
This malfunction appears to have triggered a cascading effect, amplifying disruptions in other Microsoft 365 services dependent on Entra ID authentication.
Microsoft engineers are currently examining recent configuration changes made within the AFD environment that may have led to the system instability. They are also analyzing diagnostic logs to pinpoint the root cause of the failure and understand how it propagated through the infrastructure.
Ongoing Investigation and Mitigation Efforts
The company stated that efforts are now focused on load-balancing infrastructure, which distributes user traffic across multiple servers to ensure smooth performance. A fault in this system could explain the intermittent connectivity and authentication failures observed by users worldwide.
Microsoft confirmed that it is implementing mitigation strategies to stabilize affected systems and restore full functionality.
The company has committed to providing a status update on Thursday, October 9, 2025, at 5:30 PM GMT+5:30, as engineers continue to work toward a resolution.
