I see there are a few threads about this but not sure one is specific to my cause since I'm not from North America or did I buy the game digitally. If there is a thread then close this one.

In my Collector's Edition copy, I got a code that I was to input using the PSN redeem code. When I do it says that I have either already redeemed the code or the code is invalid despite only getting the game. I thought I was the only one getting this until I saw someone else in the game mention they have the same problem.