Microsoft is investigating an ongoing service disruption that is preventing some users from setting up multi factor authentication and accessing the My Sign Ins portal.
Quick Summary – TLDR:
- Microsoft has confirmed an issue affecting MFA setup and access to the My Sign Ins platform.
- Some users are encountering 504 Gateway Timeout errors when trying to access mysignins.microsoft.com.
- Microsoft has shifted traffic to alternate infrastructure and is monitoring recovery efforts.
- The outage could impact onboarding, account recovery, and organizations that require MFA registration.
What Happened?
Microsoft has acknowledged a service issue that is preventing some customers from completing multi factor authentication (MFA) registration or accessing the My Sign Ins portal. The company first confirmed the incident through its Microsoft 365 Status account and later provided additional details through the Microsoft 365 Admin Center under incident ID MO1329260.
According to Microsoft, affected users may be unable to set up MFA or manage their sign in security settings through the My Sign Ins website.
We’re investigating an issue where some users may be unable to setup MFA or access the https://t.co/nvKILPBBVJ website. For more information, please see MO1329260 in the admin center.
— Microsoft 365 Status (@MSFT365Status) June 1, 2026
Users Encountering 504 Gateway Timeout Errors
As the outage unfolded, Microsoft revealed that some customers were seeing 504 Gateway Timeout errors when attempting to access the My Sign Ins portal.
The company stated:
Additional information shared through the Microsoft 365 Admin Center noted:
The My Sign Ins platform serves as a key self service portal that allows users to manage authentication methods, review recent sign in activity, and update security information without requiring assistance from IT administrators.
Because of its role in identity management, even a short disruption can create operational challenges for businesses that rely heavily on Microsoft 365 services.
Microsoft Deploys Mitigation Measures
In response to the incident, Microsoft said it has already taken steps to reduce the impact on customers.
According to an update shared in the admin center, the company completed mitigation actions by failing over affected services to alternate healthy infrastructure. Microsoft said it is now closely monitoring service telemetry to verify that systems return to normal operation.
The company stated:
At the time of writing, Microsoft has not disclosed the root cause of the outage or provided an estimated timeline for full resolution.
Potential Impact on Organizations
The disruption may have broader implications for organizations that enforce strict identity and access controls.
Many businesses use Conditional Access policies that require users to complete MFA registration before accessing Microsoft 365 resources. If users cannot finish the registration process, they could temporarily lose access to critical workplace applications and services.
The outage may also affect:
- Employee onboarding workflows
- Account recovery processes
- Security policy enforcement
- User self service authentication management
Administrators are being advised to monitor the incident closely, document affected users, and review access policies where necessary until service stability is fully restored.
Handling incidents like this falls to Azure administrators, whose identity and MFA responsibilities are formalized in Microsoft’s AZ-104 certification, and many prepare for it with practice materials such as Pass4sure before stepping into the role.
Microsoft Continues Recovery Efforts
Microsoft classified the situation as an ongoing incident and confirmed that engineering teams are continuing to evaluate additional mitigation measures. The company first acknowledged the issue around 5 AM ET, though it has not yet specified which regions or customer segments are affected.
Organizations can track further updates through incident MO1329260 in the Microsoft 365 Admin Center.
SQ Magazine Takeaway
I think this incident highlights how dependent modern organizations have become on identity services and MFA infrastructure. While the outage does not appear to be a security breach, even temporary disruptions to authentication systems can quickly affect employee productivity, onboarding, and access to critical business applications. Microsoft’s rapid failover actions are encouraging, but many IT teams will be looking for a detailed explanation once the company completes its investigation.
