Dear Customer,
Thank you for contacting the Square Enix Support Centre.
We are sorry to hear that you are encountering problems with registering your 18-digit pre-order code.
It should be noted that the pre-order code you have received should not be registered on the Square Enix Members website. Although the pre-order code is in the same format as a Members registration code, it will not work correctly with the Members website registration system.
Any registrations which users have attempted to make in the past using a pre-order code have now been removed from the Members system. Unfortunately if you have a digital pre-order copy of the game which has been purchased outside of the SE Store, you will not be able to register the game on the Members website.
In order to register your pre-order code, you should go to the following website:
http://preorder.eu.finalfantasyxiv.com/gb from 20th August
If you register your email address on the website at the moment, you will be notified as soon as the pre-order/early access registration has been made available.
For further information regarding the pre-order codes, please visit the following website:
http://support.eu.square-enix.com/faqarticle.php?id=5383&la=2&kid=67923
We are very sorry for any confusion this may have caused. Should you have any further questions, please do not hesitate to contact us again.
Kind regards,
The Square Enix Support Centre team