Outage in Duo Security
Duo Phone Call Authentication Failure for US Based Carriers
Resolved MinorIncident Report
Summary AI Generated
Duo Security experienced VOIP phone call authentication failures affecting all US region deployments for 4.2 hours. Users were unable to authenticate via phone calls but could use alternative methods like Duo Mobile Push and SMS passcodes. The issue was resolved with VoIP authentication returning to normal operation and sustained success rates.
We are currently observing a recurrence of the issue causing VOIP authentication failures in all deployments in the US region. We are working to correct the issue as soon as possible. While we work to resolve this, please use alternative authentication methods such as Duo Mobile Push, SMS passcodes etc.
A full list of available authentication methods can be found here:
https://duo.com/docs/policy#authentication-methods
Trusted by 1000+ teams
Need to monitor Duo Security outages?
Stop finding out about outages from your users. Monitor 6,320+ cloud services and get alerted the moment something breaks.
Ready to take control?
Start Free Trial
No credit card required
Set up in 2 minutes
14-day free trial
Latest Updates ( sorted recent to last )
RESOLVED
23 days ago - at 03/23/2026 02:23AM
VoIP authentication has returned to normal operation with sustained success rates observed.
MONITORING
23 days ago - at 03/23/2026 12:01AM
We are now observing high rates of success of VoIP authentication. The issue appears to be resolved but we will continue to monitor the situation.
INVESTIGATING
23 days ago - at 03/22/2026 10:13PM
We are currently observing a recurrence of the issue causing VOIP authentication failures in all deployments in the US region. We are working to correct the issue as soon as possible. While we work to resolve this, please use alternative authentication methods such as Duo Mobile Push, SMS passcodes etc.
A full list of available authentication methods can be found here:
https://duo.com/docs/policy#authentication-methods
Latest Duo Security outages
Service Outage on DUO81 - about 1 month ago
Service degradation on DUO81 - about 1 month ago
All Deployments - Entra 504 Gateway Timeouts - about 2 months ago
[US Deployments]: Duo Phone Call Authentication Failures for US Region - about 2 months ago
The Status Page Aggregator with Early Outage Detection
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 trialNo credit card required · Cancel anytime · 6320 services available
Integrations with
