Duo Security experienced a major incident on April 18, 2026 affecting SMS Message Delivery and SMS Message Delivery and 1 more component, lasting 2h 39m. The incident has been resolved; the full update timeline is below.
Affected components
Update timeline
- investigating Apr 18, 2026, 04:30 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.
- investigating Apr 18, 2026, 05:39 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.
- resolved Apr 18, 2026, 07:09 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.