What is Duo?
Duo is a multifactor authentication app that makes it much harder for hackers to access your UC Davis accounts. Even if someone has stolen your passphrase, they need a “second factor” — in most cases a temporary numeric code, to access your account.
How to get started with Duo
To enroll in Duo, follow these 3 steps. This article has instructions:
- Select a device to enroll in Duo, and enroll that device.
- Most people use their smartphone, but you can also use a token (a small piece of hardware that generates the authentication code. Some people compare them to pagers).
- Register a second device in Duo. You need a backup method in case your primary method isn't available.
- Use Duo!
Find support
If you have questions about Duo or need assistance, contact IT Express in one of three ways: start a support ticket and track your ticket through the Service Hub, email [email protected], or call (530) 754-HELP (4357).
If you work for UC Davis Health, contact the UC Davis Health Technology Operations Center at (916) 734-4357.
Latest Duo updates
Update Your Duo Mobile App by 3/31
Aggies, if you haven’t updated your Duo Mobile App in a while, you may need to take action to keep your account and data safe. Duo is requiring users to update their app to at least version 4.85.0 by March 31, 2026, because of an expiring certificate. Those who do not update their Duo Mobile App by the date above will be unable to verify their identity through Duo Push and in some cases, biometrics such as Touch ID/Face ID.
Your Digital Armor: Duo Multifactor Authentication
February 2026
Expanding Duo Risk-Based Authentication
January 2025
