Follow these steps to enroll in Duo with your smartphone. 

Before you begin:

• We recommend performing these steps during support hours (M - F, 7 a.m. - 6 p.m.).
• Make sure your smartphone is charged.
• You will need your Apple App Store or Android Play Store password to complete Step 2.
• If you are registering your smartphone as a second device, use these instructions.

Part 1: Begin Duo Enrollment from Your Computer

Note: These steps must be completed on a laptop or desktop computer.

1. To begin your Duo enrollment, open your web browser to https://computingaccounts.ucdavis.edu, select the Duo Multifactor Authentication option, and log into CAS.

2. Add Duo Mobile.

• If you have never configured Duo before, your browser will now show the Duo Enrollment screen. Click Next, then select Duo Mobile.

• If you have other devices configured for Duo, you will be prompted to log in.

• If Duo push is your chosen authentication method, you may see this prompt to enter a verification code.

Click Add a device, then select Duo Mobile.

3. Enter your phone number, then click Continue.

Part 2: Install the Duo Mobile App on Your Smartphone

1. Go to the App Store or Play Store on your smartphone.
2. Search for Duo Mobile.
3. Install the app on your smartphone. There is no fee to install the app.

NOTE: You will need your App Store or Play Store password to complete installation

Part 3: Complete Enrollment Using Your Computer and Your Smartphone

1. After completing the installation of the app on the smartphone, click Next on the computer.
   
2. With the Activate Duo Mobile screen displaying on the computer, open the Duo Mobile app on the smartphone. If you are enrolling directly from the device skip to Part 4 below.
   
3. Click the plus sign (+) in the upper right corner of the phone screen.
    
4. From the Duo Mobile app, scan the barcode that displays in the Activate Duo Mobile computer screen.
   
5. A green checkmark displays on the computer screen. You are done with enrollment!
    

Part 4: Complete Enrollment Using Your Smartphone (No Computer)

1. The Activate Duo Mobile screen displays. Click Get an activation link instead.
   
2. Enter your email address and press Send email.
   
3. On your smartphone, open your email.  You should receive an email from "Duo Security <no-reply@duosecurity.com>" with a link to a web site.  Click this link open a web site with the activation link.  On the web site, click the Activate Duo Mobile link to activate the Duo mobile application.
   
   
4. You have now enrolled the Duo mobile app. Click Continue.
   

Ready to register a second device in Duo? See KB0003229.