FAO Mods : I have recieved 2 early access codes

[Albiere]

Pre-order codes
- Pre-order codes are used here: US - EU.
- They are like this: XXXXXX-000-XXXXXX-000
- You can already use them. Just go on the page from your region, login, redeem.
- Upon entering them, you'll receive (instantly or later) an early access code.

Just received my third email with the new code, and that's also appearing now in my SE profile page under a button labelled 'View your FFXIV Heavensward Early Access', great!

However I've seen lots of people reference a pre-order code to be entered at the links helpfully provided above. This is the first time I've heard about needing a second code and I've checked through all my emails to find I don't have one! I just have the early access code.

Please can I get some clarification? Do I need this code? How can I get it? Thanks!

(Pre-ordered Digital Collector's Edition from the EU SE store at the end of March)