How to get the multiplayer working?

[WithinAmnesia]

How do we get 2 players working at the same time?
I open 3 Godot 3.5.3.NET editors, one runs the server, one runs client 1 and the other runs client 2
When client 1 logs in it is fine. When client 2 logs in it boots client 1 out? how do we get both client 1 and client 2 on the same server with the same pc to test?

"you just open two clients that connects to the same server."Yet I tried that or like what is needed?