# Duo - Partial Hardware Token Authentication Issues - United States

- Provider: [Duo Security](https://down.guide/duo)
- Level: confirmed
- Impact: Degraded
- lasted 1h 20m
- started 2026-09-03 22:04 UTC
- Core Authentication Service, Core Authentication Service, Core Authentication Service +20
- us
- id: DWN-c4e302730a
- Official page: https://stspg.io/qh1zvjqv58d7

## Updates from Duo Security
### 2026-09-03 22:04 UTC: investigating
We are investigating a partial outage affecting Duo hardware token authentication for customers on affected US deployments.
Customers using hardware tokens may experience intermittent authentication failures. Based on current information, retrying the authentication attempt is expected to succeed. Other Duo authentication methods are not expected to be impacted and can be used as alternate methods if configured and available.
Our engineering team is actively investigating and has started mitigation steps. Updates and additional details will be provided as new information becomes available.
We appreciate your patience and understanding during this time.

### 2026-09-03 22:30 UTC: monitoring
We have seen the failure rate for Duo hardware token authentication subside on affected US deployments.
Customers using hardware tokens may still experience intermittent authentication failures while we continue to monitor. Retrying the authentication attempt is expected to succeed. Other Duo authentication methods are not expected to be impacted and can be used as alternate methods if configured and available.
We will continue to monitor service stability and provide additional updates as needed.

### 2026-09-03 23:24 UTC: resolved
This issue has been resolved.
Duo hardware token authentication is now functioning normally on affected US deployments. Other Duo authentication methods were not expected to be impacted.
Thank you for your patience. If you continue to experience issues, please contact Duo Support.

---
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).