How to make a local 2 player vehicle game?

Hello!

I am fairly new to unreal and I am currently trying to make a two player vehicle game. I have set it up so both of my two vehicles use the same keyboard, but different buttons. However, only one can work at a time when I try to play the game - whichever one I set to be possessed by ‘player 0’. This also means that the split screen does not work because only one is being controlled. I have tried to fix the issue by creating new players and controller IDs but this has not helped me control both at once. How do I make it so that both can work at once?