Outage in Duo Security
US SMS delivery delays and failures
Resolved Major
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Outage Details
We are investigating an issue causing SMS delivery delays and failures in the US. We are waiting for AT&T to fix the issues on their end.
During this time, please use alternate authentication methods such as Duo Push, Duo Mobile Passcodes, Hardware Tokens etc to login to your Duo-protected integrations.
Components affected
Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message DeliveryLatest Updates ( sorted recent to last )
RESOLVED
4 days ago - at 08/06/2025 08:06AM
The issue affecting SMS delivery to US phone numbers has been resolved. Services are now fully operational.
IDENTIFIED
4 days ago - at 08/06/2025 04:49AM
We have identified an issue causing SMS delivery delays and failures in the US. We are waiting for AT&T to fix the issues on their end.
During this time, please use alternate authentication methods such as Duo Push, Duo Mobile Passcodes, Hardware Tokens etc to login to your Duo-protected integrations.
INVESTIGATING
4 days ago - at 08/06/2025 04:40AM
We are investigating an issue causing SMS delivery delays and failures in the US. We are waiting for AT&T to fix the issues on their end.
During this time, please use alternate authentication methods such as Duo Push, Duo Mobile Passcodes, Hardware Tokens etc to login to your Duo-protected integrations.
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