If you are encountering issues accessing your SQUARE ENIX Account or need to change your registered information (email address, name, etc.), please be sure to read the following articles. These will either help you resolve the issue or guide you to the relevant help form, from which we will be able to provide assistance more efficiently:

Changing your email address or other account details
https://support.eu.square-enix.com/faqarticle.php?kid=12862&id=612&la=2

I cannot log in / I have forgotten my ID or password
https://support.eu.square-enix.com/faqarticle.php?kid=78823&id=612&la=2