02l that doesn’t make much sense, how can one person from the same Lan join but the moment two people join it doesn’t work

Every time my 4th friend joins (whoever joins last, it’s not one friend it happens to) they get an error saying the lobby isn’t open. We are playing with two couples and have two LANs (2 people are on one LAN and the other two are on the same LAN as well) any advice?

JezuzLizard my multiplayer is installed and it still won’t work, is there a guide showing a step by step to ensure I’m understanding what you said to do correctly, my multiplier lunches.