So i've setup passwordless thru FIDO2 by adding
auth sufficient pam_u2f.so authfile=/home/me/.config/FIDO2/u2f_keys
having followed the instructions on the yubico page to generate the u2f_keys code
It's working great as an additional factor of authentication but I'd like it to be the only one (ie, we are going passwordless) or at least the primary form of authentication. Right now logging in and sudo'ing results in it asking for a password and then asking to tap the key.