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Another device that can be set up for Duo is a landline phone. This should not be used as your main Duo authentication device.

Step 1: Proceed to

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Step 2: Make sure you are enrolled to Two Factor Authentication

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Step 3: Return to, and select "Manage Your Phones and Devices"

If this is your first time setting up a device, you should see the following:

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If it is not your first device, log in using any of the available options and then click on "Add a device"

Step 4: Click Start setup and select tablet as a device:

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Step 5: Enter you landline's number

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Step 6: Select the option to confirm the number

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Step 7: Congratulations! You have successfully set up a landline as a form of two factor authentication.