Resolved
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.
Posted Aug 08, 2026 - 20:07 EDT
Monitoring
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.
Posted Aug 08, 2026 - 19:04 EDT
Identified
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.
Posted Aug 08, 2026 - 17:13 EDT
This incident affected: DUO1 (Phone Call Delivery), DUO2 (Phone Call Delivery), DUO4 (Phone Call Delivery), DUO6 (Phone Call Delivery), DUO7 (Phone Call Delivery), DUO10 (Phone Call Delivery), DUO13 (Phone Call Delivery), DUO14 (Phone Call Delivery), DUO15 (Phone Call Delivery), DUO16 (Phone Call Delivery), DUO17 (Phone Call Delivery), DUO18 (Phone Call Delivery), DUO19 (Phone Call Delivery), DUO20 (Phone Call Delivery), DUO21 (Phone Call Delivery), DUO22 (Phone Call Delivery), DUO23 (Phone Call Delivery), DUO24 (Phone Call Delivery), DUO28 (Phone Call Delivery), DUO31 (Phone Call Delivery), DUO33 (Phone Call Delivery), DUO36 (Phone Call Delivery), DUO37 (Phone Call Delivery), DUO39 (Phone Call Delivery), DUO40 (Phone Call Delivery), DUO41 (Phone Call Delivery), DUO42 (Phone Call Delivery), DUO9 (Phone Call Delivery), DUO49 (Phone Call Delivery), DUO50 (Phone Call Delivery), DUO52 (Phone Call Delivery), DUO55 (Phone Call Delivery), DUO56 (Phone Call Delivery), DUO58 (Phone Call Delivery), DUO60 (Phone Call Delivery), DUO62 (Phone Call Delivery), DUO63 (Phone Call Delivery), DUO65 (Phone Call Delivery), DUO72 (Phone Call Delivery), DUO73 (Phone Call Delivery), DUO74 (Phone Call Delivery), DUO75 (Phone Call Delivery), DUO76 (Phone Call Delivery), DUO77 (Phone Call Delivery), DUO78 (Phone Call Delivery), DUO79 (Phone Call Delivery), DUO80 (Phone Call Delivery), and DUO35 (Phone Call Delivery).