Amazon sent me my code to unlock a bunch of content but the code says invalid. Amazon told me to contact Ubisoft. Has anyone else has this problem? Content that i am talking about is..

The Amazon Video Games team thanks you for purchasing "Far Cry 4" for PlayStation 4. Your purchase has qualified you for several pieces of un-lockable in-game content: Hurk's Redemption, “The Impaler” harpoon gun, the Elephant Double-Barrel Rifle, the Yak Farm Mission, and the Sony exclusive offer, the Keys to Kyrat.