Using the Duo Mobile app is the preferred method of interacting with Duo Security for two-step login.
This article contains instructions on how to download, install, and register the Duo Mobile app on Apple iOS mobile devices (iPhones and/or iPads).
Navigate to the App Store on your iOS device
Search for Duo Mobile
Press Get to download Duo Mobile app
NOTE: After registration, two-step prompts will start for your logins within the next day
When you log in to protected UO services, you will be prompted to select an authentication method: