I'm trying to not allow a player to find a new game while they're 'in' an existing game. When a match is found, I flag a player is in a game using player data and save the server info. When the game finishes, I would flag that they're not in a game.
I see a trigger for when a player is matched, but I'm not sure how to stop a player from looking for a match before this is called. Is there some kind of trigger for when a player requests to find a new match that I can listen to and return whether or not they're allowed?