Resolved
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.
Posted Oct 20, 2025 - 07:06 EDT
Identified
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.
Posted Oct 20, 2025 - 04:52 EDT
Investigating
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.
Posted Oct 20, 2025 - 04:29 EDT
This incident affected: DUO1 (Phone Call Delivery, SMS Message Delivery), DUO2 (Phone Call Delivery, SMS Message Delivery), DUO3 (Phone Call Delivery, SMS Message Delivery), DUO4 (Phone Call Delivery, SMS Message Delivery), DUO5 (Phone Call Delivery, SMS Message Delivery), DUO6 (Phone Call Delivery, SMS Message Delivery), DUO7 (Phone Call Delivery, SMS Message Delivery), DUO8 (Phone Call Delivery, SMS Message Delivery), DUO47 (Phone Call Delivery, SMS Message Delivery), DUO10 (Phone Call Delivery, SMS Message Delivery), DUO11 (Phone Call Delivery, SMS Message Delivery), DUO12 (Phone Call Delivery, SMS Message Delivery), DUO13 (Phone Call Delivery, SMS Message Delivery), DUO14 (Phone Call Delivery, SMS Message Delivery), DUO15 (Phone Call Delivery, SMS Message Delivery), DUO16 (Phone Call Delivery, SMS Message Delivery), DUO17 (Phone Call Delivery, SMS Message Delivery), DUO18 (Phone Call Delivery, SMS Message Delivery), DUO19 (Phone Call Delivery, SMS Message Delivery), DUO20 (Phone Call Delivery, SMS Message Delivery), DUO21 (Phone Call Delivery, SMS Message Delivery), DUO22 (Phone Call Delivery, SMS Message Delivery), DUO23 (Phone Call Delivery, SMS Message Delivery), DUO24 (Phone Call Delivery, SMS Message Delivery), DUO25 (Phone Call Delivery, SMS Message Delivery), DUO26 (Phone Call Delivery, SMS Message Delivery), DUO27 (Phone Call Delivery, SMS Message Delivery), DUO28 (Phone Call Delivery, SMS Message Delivery), DUO29 (Phone Call Delivery, SMS Message Delivery), DUO30 (Phone Call Delivery, SMS Message Delivery), DUO31 (Phone Call Delivery, SMS Message Delivery), DUO32 (Phone Call Delivery, SMS Message Delivery), DUO33 (Phone Call Delivery, SMS Message Delivery), DUO34 (Phone Call Delivery, SMS Message Delivery), DUO36 (Phone Call Delivery, SMS Message Delivery), DUO37 (Phone Call Delivery, SMS Message Delivery), DUO38 (Phone Call Delivery, SMS Message Delivery), DUO39 (Phone Call Delivery, SMS Message Delivery), DUO40 (Phone Call Delivery, SMS Message Delivery), DUO41 (Phone Call Delivery, SMS Message Delivery), DUO42 (Phone Call Delivery, SMS Message Delivery), DUO43 (Phone Call Delivery, SMS Message Delivery), DUO44 (Phone Call Delivery, SMS Message Delivery), DUO45 (Phone Call Delivery, SMS Message Delivery), DUO46 (Phone Call Delivery, SMS Message Delivery), DUO48 (Phone Call Delivery, SMS Message Delivery), DUO9 (Phone Call Delivery, SMS Message Delivery), DUO49 (Phone Call Delivery, SMS Message Delivery), DUO50 (Phone Call Delivery, SMS Message Delivery), DUO51 (Phone Call Delivery, SMS Message Delivery), DUO52 (Phone Call Delivery, SMS Message Delivery), DUO53 (Phone Call Delivery, SMS Message Delivery), DUO54 (Phone Call Delivery, SMS Message Delivery), DUO55 (Phone Call Delivery, SMS Message Delivery), DUO56 (Phone Call Delivery, SMS Message Delivery), DUO57 (Phone Call Delivery, SMS Message Delivery), DUO58 (Phone Call Delivery, SMS Message Delivery), DUO59 (Phone Call Delivery, SMS Message Delivery), DUO60 (Phone Call Delivery, SMS Message Delivery), DUO62 (Phone Call Delivery, SMS Message Delivery), DUO63 (Phone Call Delivery, SMS Message Delivery), DUO64 (Phone Call Delivery, SMS Message Delivery), DUO65 (Phone Call Delivery, SMS Message Delivery), DUO66 (Phone Call Delivery, SMS Message Delivery), DUO67 (Phone Call Delivery, SMS Message Delivery), DUO68 (Phone Call Delivery, SMS Message Delivery), DUO69 (Phone Call Delivery, SMS Message Delivery), DUO70 (Phone Call Delivery, SMS Message Delivery), DUO71 (Phone Call Delivery, SMS Message Delivery), DUO72 (Phone Call Delivery, SMS Message Delivery), DUO73 (Phone Call Delivery, SMS Message Delivery), DUO74 (Phone Call Delivery, SMS Message Delivery), DUO75 (Phone Call Delivery, SMS Message Delivery), DUO76 (Phone Call Delivery, SMS Message Delivery), DUO77 (Phone Call Delivery, SMS Message Delivery), DUO78 (Phone Call Delivery, SMS Message Delivery), DUO79 (Phone Call Delivery, SMS Message Delivery), DUO80 (Phone Call Delivery, SMS Message Delivery), DUO81 (Phone Call Delivery, SMS Message Delivery), and DUO35 (Phone Call Delivery, SMS Message Delivery).