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I have 2 yubikeys and both are having the same GPG master key besides 3 subkeys for encrypting, signing and authentication, I can encrypt/decrypt and everything regarding gpg seems to be working fine, the problem is when I am trying to use both keys for login via ssh.

Both keys return the same public key when doing:

$ gpg --export-ssh bar@foo
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABA...Q== openpgp:0x5867D430

When doing ssh-add -L only one key returns the same output of the previous command, inded only changes the comment:

$ ssh-add -L
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABA...Q== cardno:000605488855

But the other key (having the same GPG keys) returns a different key, therefore I can't use it.

The output of gpg --card-status including fingerprint's is the same in both keys.

How could I configure (backup) both keys to work with the same ssh public key as in with GPG?

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