You are required to set up Duo on more than one device which can be another phone in case you forget a phone at home or are not at your office phone. When you are doing your initial setup, you may add a landline and/or mobile. After that, when you are logging in, you can choose which line Duo will send the authentication request to (via Duo Mobile app or phone call depending on what you chose).

To learn more, click here.

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