What happens when your phone is in airplane mode or doesn't have service and you realize you need your second factor to access your important apps? With Duo's one time passcode generation in Duo Mobile you can login anywhere, anytime, no phone service required. Follow these steps:
1. On the second factor authentication screen, click Enter a Passcode.
2. Open the Duo Mobile app on your tablet or smartphone.
3. In the Duo Mobile app, tap the down arrow or key icon on the right side of the screen.
A six-digit passcode will be shown.
4. Enter this code in the two-step authentication screen and click Log In.