# \[US Deployments\]: Duo Phone Call Authentication Failures for US Region

- Provider: [Duo Security](https://down.guide/duo)
- Level: confirmed
- Impact: Degraded
- lasted 4h 18m
- started 2026-02-23 14:02 UTC
- Phone Call Delivery, Phone Call Delivery, Phone Call Delivery +46
- us
- id: DWN-30b129894d
- Official page: https://stspg.io/fckcy3h0p8jr

## Updates from Duo Security
### 2026-02-23 14:02 UTC: investigating
We are currently investigating an issue causing an abnormal phone call authentication success rate for the US region.
Please check back here or subscribe to updates for any changes.

### 2026-02-23 17:26 UTC: monitoring
The issue causing an abnormal phone call authentication success rate is tied to a third-party carrier. We are monitoring the third-party's communications at this time and can confirm that Duo telephony services are functioning as expected at this time.

### 2026-02-23 18:20 UTC: resolved
The issue causing an abnormal phone call authentication success rate has been resolved by the third-party carrier.

---
down.guide reads providers' official status pages every minute and adds its own evidence, always labeled. Free, no account. Agents: MCP at https://down.guide/mcp, REST at https://down.guide/api/v1, feeds at https://down.guide/feed. Built by Sazabi (https://sazabi.com/?utm_source=down-guide&utm_medium=markdown).