Ok I found it, I didn't even read the second part of the instructions the mod posted:

Once these emails are dispatched, you can retrieve your Early Access code(s) any time from your profile page on the Square Enix Store. Log into the site, then click "My Account" in the upper right section of the screen, and select "My Profile" in the drop down window. From this page, you can view your Early Access code(s) by selecting the "View your FFXIV Heavensward early access" button.
Although I never got the mail.