Microsoft Investigates MySigns-In Outage and MFA Setup Failure

Microsoft is investigating a service disruption affecting users attempting to set up multi-factor authentication (MFA) or access the self-service sign-in portal at mysignins.microsoft.com. The company’s Microsoft 365 Status account on X (formerly Twitter) officially acknowledged the issue on June 1, 2026.

The company’s official statement read: “We’re investigating an issue where some users may be unable to setup MFA or access the mysignins.microsoft.com website.” Microsoft has directed affected organizations to reference incident tracking code MO1329260 in the Microsoft 365 Admin Center for real-time updates and remediation guidance.

The outage directly impacts users’ ability to enroll in or modify MFA settings, a critical security control for enterprise environments. The mysignins.microsoft.com portal allows end users to manage their authentication methods, review recent sign-in activity, and configure security info without requiring IT helpdesk intervention.

Disruption to this service can create bottlenecks in onboarding workflows, account recovery processes, and security policy enforcement.

Organizations enforcing Conditional Access policies that require MFA registration may find new or existing users temporarily locked out of Microsoft 365 services as a downstream effect of this outage.

What Administrators Should Do

• Navigate to the Microsoft 365 Admin Center and search for incident MO1329260 under Service Health for the latest status updates
• Temporarily consider adjusting Conditional Access policies to avoid locking out users who cannot complete MFA setup during the outage window
• Monitor the @MSFT365Status Twitter/X account for real-time incident updates
• Document affected users to prioritize MFA re-enrollment once the service is restored

Microsoft has not yet disclosed the root cause or an estimated time to resolution. The company routinely publishes post-incident reviews for significant service disruptions, which are made available through the Admin Center after resolution.

Administrators and security teams are advised to stay on alert, as outages affecting MFA infrastructure can create temporary security gaps if not properly managed.

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