Does anyone want to play multiplayer?

i can't seem to put in the papers in the sorting machine as i can't seem to line it up in one of the guides the machine seems to have smth that helps it snap into place that wasn't there for me

Myself and 4 other friends were trying to do some escaping but we can't get a game going. Everytime we hit join after entering the code it gives the joining screen then we're back to the multiplayer menu. Join through steam options takes us back to the title screen then the main menu. Weirdly enough sometimes we had 1 person join 1 other person but we could never get all in one lobby. One person could join another but not anyone else and vice versa if that makes sense. We tried restarting steam, restartin...

Puzzle so hard but it take an hour to solve it

What's the logic behind it? I just don't get it. I've seen a video on youtube but they don't explain how they arrive at the answer so i'm stumped how you work out the solution.