SMS Delivery Failures

What to do

• Check whether you use Duo Security SMS Message Delivery, SMS Message Delivery, SMS Message Delivery, SMS Message Delivery and 44 more 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 2h 40m it lasted.

  Anything that failed between 2026-04-18 04:30 UTC and 2026-04-18 07:09 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 3

1. investigatingApr 18, 2026, 4:30 AM UTC

   We are currently detecting an issue with carriers in the US region for SMS delivery. We are currently working with providers to restore the service. In the meantime, please use other means of authentication such as Duo Push.

   provider

2. investigatingApr 18, 2026, 5:39 AM UTC

   We are continuing to investigate the SMS delivery issue impacting all customers in the US region. Push notifications will continue to work as expected. Further updates will be provided as more information becomes available.

   provider

3. resolvedApr 18, 2026, 7:09 AM UTC

   The SMS delivery issue impacting customers in the US region has been resolved. SMS passcode authentication is now functioning normally. We apologize for any inconvenience caused and thank you for your patience.

   provider

Corrections

None so far.

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