Mog Station does not support changing credit/debit card if card type hasn't changed.

[Enkidoh]

Yeah the system does actually allow you to change your card details even if the actual card type is still the same and all that has changed is the expiry date and security number due to being issued a new card. Have you tried updating the card details not in the Mogstation but through the Square Enix Account Management System? That's where I update my card details as I use the same card to pay for both my FFXIV subscription and my FFXI subscription and I've never had any problems updating my card info there. The SE Account Management System can be found here: https://secure.square-enix.com/accou...n?cont=account

[Torquil]

Yeah the system does actually allow you to change your card details even if the actual card type is still the same and all that has changed is the expiry date and security number due to being issued a new card. Have you tried updating the card details not in the Mogstation but through the Square Enix Account Management System? That's where I update my card details as I use the same card to pay for both my FFXIV subscription and my FFXI subscription and I've never had any problems updating my card info there. The SE Account Management System can be found here: https://secure.square-enix.com/accou...n?cont=account

Which is what I ended up doing, but it's silly that I couldn't do it through Mog Station when it presents options for updating payment information.