Cisco-owned multi-factor authentication (MFA) provider Duo Security is investigating an ongoing outage that has been causing authentication failures and errors starting three hours ago.

https://www.bleepingcomputer.com/news/technology/ongoing-duo-outage-causes-azure-auth-authentication-errors/

Ongoing Duo outage causes Azure Auth authentication errors

Cisco-owned multi-factor authentication (MFA) provider Duo Security is investigating an ongoing outage that has been causing authentication failures and errors starting three hours ago.

BleepingComputer

@BleepingComputer
Fixed

Azure Auth authentication errors

Incident status: Monitoring

We have identified the root cause of the issue causing authentication errors with Microsoft Azure Conditional Access Duo protected applications. The issue has auto-resolved and we are now monitoring for stability.