Where do I enter this code?

Hey guys,

Not a new age gamer, just a mom trying to help her son wrestle with Bret Hart on the new game.

We ordered the deluxe version, but it still had many locked players.

We bought the online supercharger pack…which after reviewing the contents, was included in the original game. Oops. What a waste of money :(

But there is a code on the inside of the game on an insert? Can anyone advise where I input that and what it gives us?

He is gaming on an XBOX Series X.

Thanks yall, appreciate you