Duo Phone Call Authentication Failure for US Based Carriers
Incident Lifecycle
Incident Timeline
Monitoring
We are now observing high rates of success of VoIP authentication. The issue appears to be resolved but we will continue to monitor the situation.
Mar 23, 2026 at 12:01 AM UTC
Investigating
We are currently observing a recurrence of the issue causing VOIP authentication failures in all deployments in the US region. We are working to correct the issue as soon as possible. While we work to resolve this, please use alternative authentication methods such as Duo Mobile Push, SMS passcodes etc.
A full list of available authentication methods can be found here:
https://duo.com/docs/policy#authentication-methods
A full list of available authentication methods can be found here:
https://duo.com/docs/policy#authentication-methods
Mar 22, 2026 at 10:13 PM UTC
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