Prerequisites:
Make sure your phone is running a supported Operating System (OS).
Have your computer and phone available to complete the initial phone enrollment.
...
On your computer screen, click “Log in with Duo”
You’ll see a verification code appear.
Keep this window open on your computer screen.On your phone, enter the “Verification code” that appears on your computer screen and tap “Verify”.
Note: If you see a prompt to update your phone’s operating system version, please update it at your earliest convenience.You should see your newly enrolled phone appear in the Fairfield University Duo Device Management Portal.
You should receive an email confirmation that a new device was added to your Duo account.