Outage in Cisco Duo

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

Resolved Minor

February 23, 2026 - Started 2 days ago - Lasted about 4 hours
Official incident page

Incident Report

Summary AI Generated

Cisco Duo experienced phone call authentication failures in the US region for 4.4 hours, causing an abnormally low success rate for users attempting to authenticate via phone calls. The issue was traced to a third-party carrier problem rather than Duo's internal systems. The incident was resolved when the third-party carrier fixed their service.

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.

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 Delivery Cisco Duo Phone Call Delivery

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Latest Updates ( sorted recent to last )

RESOLVED 2 days ago - at 02/23/2026 06:20PM

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

MONITORING 2 days ago - at 02/23/2026 05:26PM

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.

INVESTIGATING 2 days ago - at 02/23/2026 02:02PM

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.

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