It was a duplicate key.
I want a new key.

Got the key at https://www.mmorpg.com/giveaways/wild-buster-heroes-of-titan-free-trial-giveaway-1000000866 and didn't use it or post it anywhere else, cause it doest apply to my country or my friend's, no way it could have been used by someone else. But anyway if I can get my hands on another one Ill update.