MO1237461: Microsoft 365 suite Service Health Incident (Service Restored)

[365 Service Alert]

Users may experience issues when trying to access services that require Multi-Factor Authentication (MFA).                                                                                                                                                                                                  

Users may experience issues when trying to access services that require Multi-Factor Authentication (MFA) ID: MO1237461 Issue type: Incident Status Service Restored Impacted services Microsoft 365 suite Details Title: Users may experience issues when trying to access services that require Multi-Factor Authentication (MFA) User impact: Some users may experience issues accessing Microsoft 365 services, particularly during sign‑in or authentication. More Info: Customers in North America who leverage Cisco/Duo in their MFA sign-in flow were impacted. Final status: We've confirmed that the reported impact has been mitigated. Our investigation determined that Microsoft services were operating as expected throughout the incident. We’ve confirmed with a third‑party authentication provider (Cisco/Duo) that a fix deployed within their environment has resolved the issue, and we’re seeing successful authentication attempts. Scope of impact: This issue may have affected any user within your organization leveraging MFA for sign-in. We've confirmed the following region(s) were impacted by this issue: North America. Additional impacted region(s) may be included as our investigation continues. Start time: Monday, February 23, 2026, at 2:00 PM UTC End time: Monday, February 23, 2026, at 4:38 PM UTC Preliminary root cause: A third‑party authentication provider experienced an issue within their environment, which resulted in authentication failures when users attempted to sign in to Microsoft services that depend on that provider. Next steps: This incident is considered resolved by a third-party without Microsoft action. We’ll continue to monitor service telemetry to ensure ongoing stability. This is the final update for the event. Is this message helpful? Did you find this email helpful? Yes No To customize what’s included in this email, who gets it, or to unsubscribe, set your Service health preferences. If you are receiving this email because your Admin added you as a recipient, please contact your Admin to unsubscribe. Privacy Statement Microsoft Corporation, One Microsoft Way, ​Redmond, WA 98052​