(UE5-0) Returning Lobby Create Steam Advanced Session Server

Hello. I am trying to Create Advanced Steam Session for 8 months. But I fail.

Wath the video 15 sec.

I did all things. I am creating session in thirdperson template and opening map then returning lobby…

WHY ?
Kicking me on the main menu

EDIT : I found the solution … You need to open C++ project. Not Blueprint.
If you create BP project Creating Session is always Fall.