# SMS Delivery Failures

- Provider: [Duo Security](https://down.guide/duo)
- Level: confirmed
- Impact: Partial outage
- lasted 2h 40m
- started 2026-04-18 04:30 UTC
- SMS Message Delivery, SMS Message Delivery, SMS Message Delivery +45
- us
- id: DWN-8b1633e14a
- Official page: https://stspg.io/kwcmc8m4mhtc

## Updates from Duo Security
### 2026-04-18 04:30 UTC: investigating
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.

### 2026-04-18 05:39 UTC: investigating
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.

### 2026-04-18 07:09 UTC: resolved
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.

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