I cant ssh from ubuntu

i tried to use ssh to connect to my gitlab I followed all the procedure provided int this linkhttps://gitlab.tradebyte.org/help/ssh/README#ed25519-ssh-keys
but it keep saying git@gitlab.com: Permission denied (publickey,keyboard-interactive)
can you tell ne what is the problem and when i tried this command ssh -Tvvv git@gitlab.com the is nothing i could understand