Outage in Duo Security
Duo Phone Call Authentication Failure for US Based Carriers
Resolved MinorIncident Report
Summary AI Generated
Duo Security experienced a 3.3-hour outage affecting VOIP phone call authentication for all US-based deployments, preventing users from completing two-factor authentication via voice calls. Users were advised to use alternative authentication methods including Duo Mobile Push notifications or SMS passcodes during the incident. The service was fully restored with normal VOIP authentication operations resuming after monitoring confirmed sustained success rates.
We are currently investigating an issue causing VOIP authentication failures in all the deployments in the US region and are working to correct the issue as soon as possible. At this time please use alternative authentication methods such as Duo Mobile Push, or SMS passcodes.
A list of all other alternative authentication methods can be found here:
https://duo.com/docs/policy#authentication-methods
Please check back here or subscribe to updates for any changes.
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Latest Updates ( sorted recent to last )
RESOLVED
20 days ago - at 03/22/2026 08:33PM
VoIP authentication has returned to normal operation with sustained success rates observed.
MONITORING
20 days ago - at 03/22/2026 08:00PM
We are now observing high rates of success of VoIP authentication. We will continue to monitor the situation.
INVESTIGATING
20 days ago - at 03/22/2026 07:13PM
We are observing a recovery in voice call processing across the U.S. and are continuing to investigate the root cause of this impact.
INVESTIGATING
20 days ago - at 03/22/2026 05:18PM
We are currently investigating an issue causing VOIP authentication failures in all the deployments in the US region and are working to correct the issue as soon as possible. At this time please use alternative authentication methods such as Duo Mobile Push, or SMS passcodes.
A list of all other alternative authentication methods can be found here:
https://duo.com/docs/policy#authentication-methods
Please check back here or subscribe to updates for any changes.
Latest Duo Security outages
Service Outage on DUO81 - about 1 month ago
Service degradation on DUO81 - about 1 month ago
All Deployments - Entra 504 Gateway Timeouts - about 2 months ago
[US Deployments]: Duo Phone Call Authentication Failures for US Region - about 2 months ago
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