The most common cause of this is the extra layer of security required that involves confirming the cardholder postcode when adding a card to your account.
Please Note: This is not always your home postcode, it is the postcode that the card is registered to.
If you have moved house since you were last issued a card by your provider your card may still be registered to the old address, or it may have been entered incorrectly when you gave them your new address.
In this case please Contact Us and our technical team will take a closer look. Be sure to select Technical Support as your reason for enquiry and provide as much detail as possible (but not your card details). Please also provide the best times we can reach you by phone.