When, where and how will I need to use this passcode once I’ve registered?

If you would like to receive a passcode to access applications requiring multi-factor authentication, DUO will ask you to choose an option for authenticating: “Call Me”, “Enter Passcode”, or “Send Me a Push”. Select “Enter a Passcode” and select “Text Me New Codes”. DUO will send a text containing the passcode to your registered device. Enter the passcode that you received into the application to be allowed access.