What does it say when you type it in? "Invaild or already used"?
If you contacted them and they confirmed it was a valid code, you probably just typed it in wrong. How many times did you try it before posting on here?
i have tried several times and it writes that "the code is incorrect or has expired " or something like that . I bought this game 1 week ago. But again Ubisoft says that is valid so it is not possible the code has expired