Check your projects .log files (Located in Projects Saved\Logs directory)
What is the difference between a Lobby and a Session?
A lobby is a “pre-game” room where you can gather your friends to chat and pick what maps or game modes to play, it can also used as a “group system” between games because you’ll not leave a Lobby unless explicitly doing so, for example you will not automatically leave a lobby just because you left a game session, this way you’ll all be in the same lobby together until you exit the game or leave the lobby.
A game session is where you play the game, you’re all connected to a server and playing the game.
PLAYER COUNT IS STUCK AT 0
If you’re using a Dedicated Server setup you have to authenticate the player for them to be registered on the server
WHERE CAN I FIND MY LOG FILES?
Log files are generated in X:\Project\Saved\Logs The newest logfile will be called Project.log If you are running a Standalone Instance the log file will be named Project_2.log