I keep having issues with my codes not working properly. I have had some that have already been registered and others that I can link to my account but am unable to receive the item in game. I tired to submit a separate code and the first code was removed from the redeem code history. I really appreciate the opportunity for the boosted XP, but I feel that I have spent more time trying to fix the issue with the code not working than it would have taken me to hit level cap in the first place without the XP boost.