How to Use the Duo Mobile App Passcode (Web Apps) Be sure to have the 6-digit passcode you generated from the Duo Mobile app before moving ahead: Step 1 In the login window, enter your NetID and Patriot Pass Password. Step 2 In the 2FA login window, click Enter a Passcode. Step 3 In the "Passcode" field, enter the six-digit passcode generated from the Duo Mobile app and click Log In. Last modified: February 19, 2021