How to use Duo Mobile passcode

Duo Mobile passcode is a secondary authentication option in the Duo Mobile app. While less convenient than Duo Mobile Verified Push, it works without an internet connection, making it useful when mobile data or Wi-Fi is unavailable.

How Duo Mobile passcode works

After you log in with your username and password, Duo prompts you to "Enter your passcode". In the Duo Mobile app, you will find a 6-digit passcode. Enter that passcode into the Duo prompt to complete the authentication process.

How to set up Duo Mobile passcode

If you have already set up the Duo Mobile Verified Push option, you are ready to use Duo Mobile passcode as well. If you have not, please see the instructions to set up Duo Mobile Verified Push.

How to authenticate using Duo Mobile passcode

1. Log in to a Duo-protected service using your username and password
2. Duo will prompt you to "Enter your passcode". If you do not see the this prompt, Duo may have defaulted to a different authentication method. Click "Other options" and then "Duo Mobile passcode" to manually select this option. If you do not see "Duo Mobile passcode" in the list of options, you have not set up this method yet. Refer to the instructions above.
3. Open the Duo Mobile app on your mobile device and find the 6-digit passcode next to Caltech.
4. Enter that passcode into the Duo prompt and select "Verify" to proceed.