You can remove an enrolled device at any time as long as you always have one device on your account.
In a web browser go to 2fa.gmu.edu. Click 2FA Account Login in the top right.
Log in with your Mason NetID and Patriot Pass Password.
Complete the second-factor authentication with your previously enrolled device.
On the Patriot Pass Password Home page, click 2FA Account from the left side menu.
On the Manage Duo 2FA Account page, locate the device you want to remove from the list.
Click the trash can next to the device that you would like to remove.
It will prompt you to confirm your action, click OK. Your device has been removed.