Configuring remote python interpreter

Hi all, 

I have a cloud dev desktop and I try to configure a remote interpreter via pycharm and I receive authentication error although the remote server is accessible through terminal with ssh pair key. In addition, I was able to configure remote interpreter to other servers. I can provide additional photos of what I tried to do.

This is how I configured the connection to the server.

Error.

here you can see I was able to connect via terminal using ssh + pair key.

Thanks.