SWITCH: Logging in to multiple users not working

So apparently you’re supposed to be able to log in to multiple local accounts to play with friends coop on the same screen, but something got screwed over by the Nintendo online function, so now you can’t even do that anymore.
I tried everything, but whenever you press join on the second controller it’s just the “skip” button that is avaliable while all the other users are greyed out… This is not acceptable and playing coop is now rendered USELESS!
And while you’re at it, look at your GR LEADERBOARDS to see some blatant cheating on all fronts.