Das ist keiner der default Keynamen. Ohne Angabe eines Keys fragt SSH nur diese ab.
-i identity_file
Selects a file from which the identity (private key) for public key authentication
is read. The default is ~/.ssh/identity for protocol version 1, and ~/.ssh/id_dsa,
~/.ssh/id_ecdsa, ~/.ssh/id_ed25519 and ~/.ssh/id_rsa for protocol version 2.
Identity files may also be specified on a per-host basis in the configuration file.
It is possible to have multiple -i options (and multiple identities specified in
configuration files). ssh will also try to load certificate information from the
filename obtained by appending -cert.pub to identity filenames.