Duo Security incident

Duo Phone Call Authentication Failure for US Based Carriers

Notice Resolved View vendor source →

Duo Security experienced a notice incident on March 22, 2026, lasting 3h 15m. The incident has been resolved; the full update timeline is below.

Started
Mar 22, 2026, 05:18 PM UTC
Resolved
Mar 22, 2026, 08:33 PM UTC
Duration
3h 15m
Detected by Pingoru
Mar 22, 2026, 05:18 PM UTC

Update timeline

  1. investigating Mar 22, 2026, 05:18 PM UTC

    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.

  2. investigating Mar 22, 2026, 07:13 PM UTC

    We are observing a recovery in voice call processing across the U.S. and are continuing to investigate the root cause of this impact.

  3. monitoring Mar 22, 2026, 08:00 PM UTC

    We are now observing high rates of success of VoIP authentication. We will continue to monitor the situation.

  4. resolved Mar 22, 2026, 08:33 PM UTC

    VoIP authentication has returned to normal operation with sustained success rates observed.