I have successfully configured my home system and server to use Yubikey for local login and ssh access, respectively. But when I try to setup the libpam-u2f module to let me use the Yubikey to secure sudo, it can't detect the U2F device.
How can I allow my server to see that device and use it for authentication?
My local system is using Ubuntu 21.04 and the server is using Ubuntu 20.04