Duo Security incident
Duo Phone Call Authentication Failures - United States
Duo Security experienced a minor incident on August 8, 2026 affecting Phone Call Delivery and Phone Call Delivery and 1 more component, lasting 2h 54m. The incident has been resolved; the full update timeline is below.
Affected components
Update timeline
- identified Aug 08, 2026, 09:13 PM UTC
We have identified an issue causing phone call authentication failures for customers in the United States. This is related to a third-party carrier disruption. We are actively monitoring the carrier issue and working with our provider as needed. Please check back here or subscribe to updates for any changes.
- monitoring Aug 08, 2026, 11:04 PM UTC
We are seeing recovery for the issue related to a third-party carrier disruption that caused phone call authentication failures for customers in the United States. We are actively monitoring phone call authentication delivery and will provide another update once the issue is fully resolved.
- resolved Aug 09, 2026, 12:07 AM UTC
Phone call authentication delivery for customers in the United States has returned to normal operation. If customers continue to experience issues, please contact Duo Support.