Outage in Cisco Duo
Duo Phone Call Authentication Failures - United States
Resolved MinorIncident Report
Summary AI Generated
Cisco Duo experienced phone call authentication failures for US customers due to a third-party carrier disruption, lasting approximately 3 hours. Phone Call Delivery was affected, preventing users from completing phone-based multi-factor authentication. The carrier issue recovered and service returned to normal operation, with Duo Support available for any lingering issues.
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.
Components affected
Cisco Duo Phone Call Delivery Cisco Duo Phone Call Delivery Cisco Duo Phone Call Delivery Cisco Duo Phone Call Delivery Cisco Duo Phone Call Delivery Cisco Duo Phone Call Delivery Cisco Duo Phone Call Delivery Cisco Duo Phone Call Delivery Cisco Duo Phone Call Delivery Cisco Duo Phone Call Delivery Cisco Duo Phone Call Delivery Cisco Duo Phone Call Delivery Cisco Duo Phone Call Delivery Cisco Duo Phone Call Delivery Cisco Duo Phone Call Delivery Cisco Duo Phone Call Delivery Cisco Duo Phone Call Delivery Cisco Duo Phone Call Delivery Cisco Duo Phone Call Delivery Cisco Duo Phone Call Delivery Cisco Duo Phone Call Delivery Cisco Duo Phone Call Delivery Cisco Duo Phone Call Delivery Cisco Duo Phone Call Delivery Cisco Duo Phone Call Delivery Cisco Duo Phone Call Delivery Cisco Duo Phone Call Delivery Cisco Duo Phone Call Delivery Cisco Duo Phone Call Delivery Cisco Duo Phone Call Delivery Cisco Duo Phone Call Delivery Cisco Duo Phone Call Delivery Cisco Duo Phone Call Delivery Cisco Duo Phone Call Delivery Cisco Duo Phone Call Delivery Cisco Duo Phone Call Delivery Cisco Duo Phone Call Delivery Cisco Duo Phone Call Delivery Cisco Duo Phone Call DeliveryTrusted by 1,000+ teams
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Latest Updates ( sorted recent to last )
RESOLVED
2 days ago - at 08/09/2026 12:07AM
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.
MONITORING
2 days ago - at 08/08/2026 11:04PM
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.
IDENTIFIED
2 days ago - at 08/08/2026 09:13PM
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.
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