Can't begin VS Mode

Hey SnoFitzroy​ , can you try using your keyboard/mouse + another controller (so just the pair of JoyCons or the PS4 controller) ? Also, try to launch the game with no controller at all, just your keyboard/mouse and try connecting the controller once you're in the game to see how it goes.

Once the second controller is detected, it should tell you which button to press to join as Player 2. But let's see first how it goes with the steps above.

If it still doesn't work, can you let me know if you're playing on Steam or EA app? Thanks!

Those precise steps are what I was already doing. I already only boot up the game with KBM then add a controller later. While the game is clearly trying to tell me what button to press, it's a generic button that doesn't exist on any of the controllers, regardless of connection order or if it's only one of them. I've also tried pressing literally every button on each controller and it seems [-] doesn't do anything on JC and [Share] and [Large Rectangle] on PS4 also don't do anything, while every other button on each controller has an input that is recognized as a specific action (moving cursor, pause menu, etc).

I'm playing on Steam.