Promotion is up on Amazon

[Sakuraluna]

So I spoke to a live rep and he gave me a code, but it only 16 Digits and when I enter it on Mog Station under enter item code it say invalid. So is the code I got missing a few digit or I enter it at a wrong place?

Wrong place. If I'm correct, you go here: http://www.ffxivredeem.com and input the code, and it'll give you a series of additional codes that you put in at mogstation.