Notably, Twitter doesn't support adding multiple U2F keys. The current state of USB ports makes it really important to be able to add multiple keys to an accou

Notably, Twitter doesn't support adding multiple U2F keys. The current state of USB ports makes it really important to be able to add multiple keys to an account. From my experience you need 1) USB A key that are used on most devices, 2) USB C keys that can be used on devices like MVP, 3) NFC keys to work from your Android device.