"We're investigating an issue where some users may be unable to setup MFA or access the http://mysignins.microsoft.com website," Microsoft wrote on its Microsoft 365 Status account. The brief bulletin, posted after the company confirmed the problem around 5 AM ET, describes an active service disruption that is preventing customers from enrolling in multi‑factor authentication (MFA) and from reaching the My Sign‑Ins portal.
Microsoft 365 Status account update and timeline
Microsoft first acknowledged the outage about 5 AM ET, posting to its Microsoft 365 Status account and publishing additional details in the admin center under advisory MO1329260. The company classified the event as an "ongoing incident," language the advisory says is commonly used to denote critical service issues with noticeable user impact. Microsoft has not published region‑specific scope for the outage.
Technical symptom: 504 Gateway Timeout errors
The admin center advisory spells out the visible symptom for affected users: "Some users may be unable to setup Multi‑Factor Authentication (MFA) or access the mysignins.microsoft.com website. Users may encounter 504 Gateway Timeout errors when trying to access mysignins.microsoft.com." The 504 Gateway Timeout designation indicates requests to the My Sign‑Ins endpoint are timing out before receiving an expected response.
Mitigation measures Microsoft has taken
Since acknowledging the incident, Microsoft reports it has taken active steps to reduce customer impact. "We've completed mitigation actions, including failing over to alternate infrastructure, and are continuing to monitor service health," the company wrote in the admin center. It also says it has shifted to "alternative healthy infrastructure" and is monitoring service telemetry to validate recovery. Because elevated error rates have continued, Microsoft added it is "actively evaluating additional mitigation options, including optimizing how service requests are processed to further stabilize the service."
Context: recent Microsoft service disruptions noted in advisory
The notice references prior service interruptions earlier this year that Microsoft resolved, including a known issue that prevented some Microsoft Teams Free users from chatting and calling others and an Outlook.com outage that interfered with mailbox access due to intermittent signing‑in problems. The current advisory does not link those past incidents to the present outage; it notes them as recent examples of resolved service problems.
What this means for technologists, administrators, and end users
- Technologists and security teams: Expect to see 504 Gateway Timeout errors in telemetry tied to mysignins.microsoft.com and to monitor Microsoft’s service health signals. Microsoft’s reported failover to alternate infrastructure and evaluation of request‑processing optimizations are the immediate items to watch as indicators of stabilization.
- Administrators and affected enterprises: Organizations with users attempting to enroll in MFA or manage sign‑ins may experience interruptions. Admins should monitor the MO1329260 advisory in the Microsoft admin center for updates and verify whether failover actions restore enrollment workflows for their tenants.
- End users: Individuals trying to set up multi‑factor authentication or access the My Sign‑Ins portal may receive 504 errors and be unable to complete those tasks until Microsoft restores full service.
Microsoft’s public updates show mitigation in motion — failing over to alternate infrastructure and watching telemetry — but elevated error rates remain, and the company is weighing further backend optimizations to stabilize request handling. The advisory is concise about observable effects and remediation steps but leaves regional impact and a final recovery time unspecified.
Original story: https://www.bleepingcomputer.com/news/microsoft/microsoft-confirms-outage-affecting-mfa-my-sign-ins-platform/
