Microsoft MFA Down - 504 Gateway Timeout Errors Disrupting MFA Access for U.S. Users

Microsoft is investigating a widespread MFA service degradation impacting users in North America, causing 504 gateway timeout errors and blocking access to Microsoft 365 services. The incident, tracked as MO1237461, began on February 23, 2026, and Microsoft is actively reviewing logs to identify the root cause without providing an estimated resolution time.