When I test the game in the Editor using play as client (2 player) everything works perfectly. I can host, and the client can join. However, when I try to test it in play as client (1 player) mode (or packaged build), pressing the “Host” button fails to open the lobby map. it acutally loads map because i was added a print string to levels event beginplay and its working but. game just goes back to mainmenu. and no sessions created.
Solved. i was using open level by name. i changed it to servertravel. its working now