Player matches question

Maybe I’m just not bright but what in the world is going on with joining player matches? (XBL, I’m assuming it’s the same for PSN)

I have no idea what any of the numbers mean (spectators, P. Slots, etc) and 95% of the time when I try to join it says “A match has already started”

Is it not possible to join a room while people inside it are actively playing a match?

Yeah, you can’t join when there’s a match in progress. Yeah, it sucks.

Private slots are basically reserve spots. People can’t join without you sending an invite.

Please use the Q&A thread for questions like this next time. Thanks