Using Fedora 31, pam_u2f and a Yubikey5 works well after:
authselect select sssd with-mkhomedir with-pam-u2f with-sudo without-nullok
pamu2fcfg –u[username] > ~/.config/Yubico/u2f_keys
However, from the console (without GDM, multi-user.target for example) it does not work: Linux will ask for my password where the yubikey should be sufficient.
Any ideas what could be wrong?