I have two Nitrokeys and wanted to have the second one as a backup. I followed the steps to create the GPG keys manually and transfer them to the Nitrokey(s) which seems to have worked fine. I can now use the backup key to sign files with gpg directly as well.
However, when I try to log in with the second key via SSH, the remote SSH server denies the key because it seems to check the serial number of the OpenPGP keycard. Is this intentional, i.e. will I have to use two distinct SSH keys and insert both in the
authorized_keys file? Or did I just do something wrong?