Visit
Duo Device Management to manage your duo authenticating devices.
You can register as many devices as you want during the initial enrollment process, including smartphones, and tablets. You can register another device from the Duo Self-Service portal once you have completed the initial registration process.
IT recommends registering a minimum of two devices, both your mobile and laptop. If you lose one of your devices, you can always use the secondary tool to control secure devices.
Note: Face ID / Touch ID are not available in Duo Self-Service.