I just purchased the game on Amazon a few days ago and registered my account. I'm receiving error i2501 on the Mog Station when trying to use the optional shop or set up a subscription. To be clear, I've not yet made any purchases on my account nor has it asked for any payment info yet, it's just blocked me before I could make a purchase. I was able to add a payment method just now through the settings page, but I still am not able to to get past the error.