authorized_keys file is actually /etc/ssh/root.pubkeys

unraid expects my authorizeD_keys here :
/etc/ssh/root.pubkeys

not here :

~/.ssh/authorized_keys

tel que vu dans mon /etc/ssh/sshd_config:

The default is to check both .ssh/authorized_keys and .ssh/authorized_keys2

but this is overridden so installations will only check .ssh/authorized_keys

replace by line below par Simon following ken-ji post here https://forums.unraid.net/topic/51160-passwordless-ssh-login/#AuthorizedKeysFile .ssh/authorized_keys

AuthorizedKeysFile /etc/ssh/%u.pubkeys #AuthorizedPrincipalsFile none