Outage in Duo Security

All Deployments: Duo Phone Call and SMS Delivery Failure

Resolved Major
October 20, 2025 - Started 1 day ago - Lasted about 3 hours
Official incident page

Incident Report

We are currently investigating an issue causing phone call and SMS delivery authentication failures on all of our deployments and are working to correct the issue as soon as possible. Please check back here or subscribe to updates for any changes.
Components affected
Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security Phone Call Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security Phone Call Delivery Duo Security Phone Call Delivery Duo Security Phone Call Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security Phone Call Delivery Duo Security Phone Call Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security Phone Call Delivery Duo Security Phone Call Delivery Duo Security Phone Call Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security Phone Call Delivery Duo Security Phone Call Delivery Duo Security Phone Call Delivery Duo Security Phone Call Delivery Duo Security Phone Call Delivery Duo Security Phone Call Delivery Duo Security Phone Call Delivery Duo Security Phone Call Delivery Duo Security Phone Call Delivery Duo Security Phone Call Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security Phone Call Delivery Duo Security SMS Message Delivery Duo Security Phone Call Delivery Duo Security SMS Message Delivery Duo Security Phone Call Delivery Duo Security Phone Call Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security Phone Call Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security Phone Call Delivery Duo Security SMS Message Delivery Duo Security Phone Call Delivery Duo Security Phone Call Delivery Duo Security Phone Call Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security Phone Call Delivery Duo Security SMS Message Delivery Duo Security Phone Call Delivery Duo Security SMS Message Delivery Duo Security Phone Call Delivery Duo Security SMS Message Delivery Duo Security Phone Call Delivery Duo Security SMS Message Delivery Duo Security Phone Call Delivery Duo Security Phone Call Delivery Duo Security Phone Call Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security Phone Call Delivery Duo Security Phone Call Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security Phone Call Delivery Duo Security Phone Call Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security Phone Call Delivery Duo Security SMS Message Delivery Duo Security Phone Call Delivery Duo Security Phone Call Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security Phone Call Delivery Duo Security Phone Call Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security Phone Call Delivery Duo Security SMS Message Delivery Duo Security Phone Call Delivery Duo Security Phone Call Delivery Duo Security SMS Message Delivery Duo Security Phone Call Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security Phone Call Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security Phone Call Delivery Duo Security Phone Call Delivery Duo Security Phone Call Delivery Duo Security Phone Call Delivery Duo Security Phone Call Delivery Duo Security Phone Call Delivery Duo Security SMS Message Delivery Duo Security Phone Call Delivery Duo Security Phone Call Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security Phone Call Delivery Duo Security SMS Message Delivery Duo Security Phone Call Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security SMS Message Delivery Duo Security Phone Call Delivery Duo Security Phone Call Delivery Duo Security SMS Message Delivery Duo Security Phone Call Delivery Duo Security SMS Message Delivery Duo Security Phone Call Delivery Duo Security Phone Call Delivery Duo Security SMS Message Delivery Duo Security Phone Call Delivery

Need to monitor Duo Security outages?

One place to monitor all your cloud vendors. Get instant alerts when an outage is detected.

Try IsDown risk-free 14-day free trial · No credit card required
Latest Updates ( sorted recent to last )
RESOLVED about 23 hours ago - at 10/20/2025 11:06AM

The issue affecting phone-based authentication and SMS delivery has now been resolved. System performance has remained stable, and all services are operating as expected across deployments.
We will continue to monitor for any anomalies, but no further impact is anticipated at this time.

IDENTIFIED 1 day ago - at 10/20/2025 08:52AM

We've identified the cause of degraded Phone Authentication and SMS delivery failures.
Our providers have acknowledged an upstream issue and are working on a resolution.

This may affect users relying on phone calls or SMS for authentication across all deployments and we suggest using alternate means of MFA such as Duo Push if possible.

Our team is working on mitigation steps and will continue to provide updates as progress is made.

INVESTIGATING 1 day ago - at 10/20/2025 08:29AM

We are currently investigating an issue causing phone call and SMS delivery authentication failures on all of our deployments and are working to correct the issue as soon as possible.

Please check back here or subscribe to updates for any changes.

Latest Duo Security outages

All Deployments: Email delivery issues - 1 day ago
[All Deployments] Duo Desktop not being recognized on Windows 11 24H2/25H2 - 6 days ago
[DUO34] Full Deployment Outage - 14 days ago
Entra ID Sync Issue Affecting Certain European Deployments - 22 days ago
[Multiple Deployments] Administrators unable to access the Duo AI Assistant for the first time - 25 days ago

The Status Page Aggregator Built for IT Teams

With IsDown, you can monitor all your critical services' official status pages from one centralized dashboard and receive instant alerts the moment an outage is detected. Say goodbye to constantly checking multiple sites for updates and stay ahead of outages with IsDown.

Start free trial

No credit card required · Cancel anytime · 4522 services available

Integrations with Slack Microsoft Teams Google Chat Datadog PagerDuty Zapier Discord Webhook