Outage in Cisco Duo
Duo Phone Call Authentication Failure for US Based Carriers
Resolved MinorIncident Report
Summary AI Generated
Cisco Duo experienced VoIP phone call authentication failures across all US region deployments for 4.2 hours. Users were unable to authenticate via phone calls but could use alternative methods like Duo Mobile Push and SMS passcodes. The issue was resolved and VoIP authentication returned to normal operation with sustained success rates.
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
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Latest Updates ( sorted recent to last )
RESOLVED
about 3 hours ago - at 03/23/2026 02:23AM
VoIP authentication has returned to normal operation with sustained success rates observed.
MONITORING
about 6 hours ago - at 03/23/2026 12:01AM
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.
INVESTIGATING
about 7 hours ago - at 03/22/2026 10:13PM
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
Latest Cisco Duo outages
Duo Phone Call Authentication Failure for US Based Carriers - about 12 hours ago
Service Outage on DUO81 - 21 days ago
Service degradation on DUO81 - 22 days ago
All Deployments - Entra 504 Gateway Timeouts - 28 days ago
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