After you are enrolled for DUO using hard token, you can login to any CAS protected application using two-factor-authentication. You will first need to enter your CAS NetID and password:
After successful authentication using your NetID and password, you will see DUO two-factor authentication page:
Click on “Enter a Passcode”
Press the green button from hard token to generate a passcode.
Click on “Enter a passcode” button on your DUO authentication page, enter the passcode from token and click “Log in”.
Successful authentication will redirect you to the application you were trying to authenticate for.