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fritz@laptop:~/.ssh$ ssh -T tallharry66@gitlab.com
The authenticity of host 'gitlab.com (2606:47...:a9b9)' can't be estab
+lished.
ECDSA key fingerprint is SHA256:....w.
...
Warning: Permanently added 'gitlab.com,2606:4700:....' (ECDSA) to the 
+list of known hosts.
tallharry66@gitlab.com: Permission denied (publickey).
fritz@laptop:~/.ssh$