I’ve looked through your post history. Our problems do not seem related. I can create a session and I can even play with my friend over Steam. So I don’t think it is a problem that whole session or online subsystem setup is invalid (like it might be in your case? I don’t know!).
I work with engine for about a year now and I have barely enough experience and knowledge to make my own game work half-decent. I get a lot of help just reading through AnswerHub, forums and tutorials.
That is exactly why I am not here trying to help other people. Because “fishing in dark” is something I expect everyone can do without my “help”.
So I appreciate that you are trying to help, but unfortunately I think that we are not in same boat here and we cannot help each other.