I just got the demo but can't get it to play local splitscreen. In the description it mentions splitscreen multiplayer, but in the demo when I try to add another player in it says I need to sign-in to a "multiplayer profile".

What is a "multiplayer profile"? I signed-in to two different accounts on both controllers, yet it keeps repeating the same thing.

I understand that this is probably too late to ask, but does anyone know?