If you need to add the Windows Offline account to Duo Mobile on a different phone than you originally used for activation, you can do this from the online Duo MFA prompt.

1. With the Windows computer connected to the internet, log in with your username and password.
2. Click the Replace/Reconnect an offline device link on the left side of the Duo prompt to begin. If your Duo for Windows Logon application is configured to automatically send a push request to your phone, you can cancel the authentication in progress and click the link on the left (don't approve the request on your phone).

3. Next, you’ll need to complete Duo authentication. Click on an available method and approve the login request.

4. Continue the activation process by scanning the QR code with Duo Mobile on the replacement phone and entering the verification code when prompted, just like the first time you activated an offline access device.

IMPORTANT: Only one phone may be activated for offline access at a time. Activating offline access on another phone invalidates the previously activated phone.