I got two codes off Amazon. The first one worked, but the second one can't be redeemed for whatever reason, which is weird since I entered them back to back.
Same thing happened to me too, I bought two codes when it went live this morning but was too sleepy to redeem then so I waited till I woke up. First one worked but I can't redeem my second.
Btw just got my amazon promotional code, I'm guessing everyone already got theirs or are getting theirs soon.