Sometimes a card either can't be added, can't be confirmed, or will only work sporadically. This can be for a few reasons. If the card is not registered on the card issuer's website with your name and address, this may cause problems. If the card is a virtual card, that will also likely cause issues. Additionally, the issues listed in this Help Center article should be reviewed for troubleshooting. If all of that is not applicable, please contact Customer Service for further assistance.