Perhaps it was only me confused as **** but I finally got mine straightened out. In case there is someone else out there as baffled:
The code you need is NOT the 20 digit code you generated from your 18 digit code. This was just for early access. If you go into account management you will likely see you only have 4 free days remaining.
Go to Amazon , log in and access your video game library. There will be a hot button to get your actual product key.
Go to your account management at Mog shop select services, click on the add icon, enter the new 20 digit code and voila it will update to CE edition with 32 days remaining.
I just got booted and can't get back in so haven't been able to check moogle mail but I suspect my items will be there. Hope this helps someone. Now after this positivity I am off to ***** in a thread about full worlds lol.