Outage in Duo Security
SMS Delivery Failures
Resolved MajorIncident Report
Summary AI Generated
Duo Security experienced SMS delivery failures affecting all customers in the US region due to carrier issues, preventing users from receiving SMS passcode authentication messages. The incident lasted 2.7 hours while Duo worked with SMS providers to restore service, with users able to use alternative authentication methods like Duo Push during the outage. SMS passcode authentication was fully restored and functioning normally after the resolution.
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.
Components affected
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Latest Updates ( sorted recent to last )
RESOLVED
about 21 hours ago - at 04/18/2026 07:09AM
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.
INVESTIGATING
about 23 hours ago - at 04/18/2026 05:39AM
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.
INVESTIGATING
about 24 hours ago - at 04/18/2026 04:30AM
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.
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