SSH login issue using ssh://

I came across some post here that saying I can use ssh://USERNAME@IP_ADDRESS to login to my server using ssh
and it does work perfectly.
also, I have no idea how it's working and knowing which SSH key is related to which instance.

now my problem is that it is working for 5/6 of my servers
for 1 server, for reason I don't know, the terminal opens and closes automatically.

I've tried to login using ssh -i KEY username@ip and it works great,
so I have only this problem with using ssh:// and to this specific server.

Do you have any idea how can I debug it? maybe see an error message somewhere?

I've looked online but I couldn't resolve this issue.
Please assist 😁

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