Duo Security incident

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

Minor Resolved View vendor source →

Duo Security experienced a minor incident on February 23, 2026 affecting Phone Call Delivery and Phone Call Delivery and 1 more component, lasting 4h 17m. The incident has been resolved; the full update timeline is below.

Started
Feb 23, 2026, 02:02 PM UTC
Resolved
Feb 23, 2026, 06:20 PM UTC
Duration
4h 17m
Detected by Pingoru
Feb 23, 2026, 02:02 PM UTC

Affected components

Phone Call DeliveryPhone Call DeliveryPhone Call DeliveryPhone Call DeliveryPhone Call DeliveryPhone Call DeliveryPhone Call DeliveryPhone Call DeliveryPhone Call DeliveryPhone Call Delivery

Update timeline

  1. investigating Feb 23, 2026, 02:02 PM UTC

    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.

  2. monitoring Feb 23, 2026, 05:26 PM UTC

    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.

  3. resolved Feb 23, 2026, 06:20 PM UTC

    The issue causing an abnormal phone call authentication success rate has been resolved by the third-party carrier.