Adding a credit card failed in the following aspects: First, the card is not activated, and the platform to be added is not recognized, and it needs to be activated before it can be used; Second, the platform to be added does not allow payment cards other than savings cards; Third, if the credit card number is entered incorrectly, you can quit and re-operate, check after entering the card number, and then confirm. As long as there is no problem with the formal platform payment binding credit card, you can ask the customer service for specific reasons, and the problem will always be solved.