Duo Phone Call Authentication Failure for US Based Carriers

What to do

• Check whether you use Duo Security in us. Check your stack

  Paste a package.json, lockfile, Terraform or a list of domains at down.guide/stack to see every provider you depend on.

• Confirm your retries, queues and scheduled jobs caught up after the 3h 15m it lasted.

  Anything that failed between 2026-03-22 17:18 UTC and 2026-03-22 20:33 UTC may need a replay.

• Subscribe to Duo Security's feed to hear about the next one first. RSS feed

  https://down.guide/feed?provider=duo works in Slack (/feed subscribe), Discord feed bots and any RSS reader.

Updates from Duo Security 4

1. investigatingMar 22, 2026, 5:18 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.

   provider

2. investigatingMar 22, 2026, 7:13 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.

   provider

3. monitoringMar 22, 2026, 8:00 PM UTC

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

   provider

4. resolvedMar 22, 2026, 8:33 PM UTC

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

   provider

Corrections

None so far.

Something wrong on this page? Report an error or send us a note. Every fix is listed here.