You should know that the secondary card is connected to the main card. When the card status is abnormal due to the improper behavior of the credit card holder, such as freezing, freezing, restricting transactions, etc. , then the secondary card cannot be used normally.

2. Credit card merchants are limited.

If the secondary card is swiped to the merchant on the blacklist of the bank, indicating that the consumer merchant is restricted, the secondary card cannot be used normally. At this time, you'd better switch to a different type of merchant for consumption, and perhaps the transaction will be successful.

3. The available quota is insufficient.

As we all know, the credit lines of the secondary card and the main card are shared. If the available credit limit of the main card is used up, then the secondary card can't trade naturally. If you want to spend, you can only ask the main cardholder to apply for a withdrawal, or pay off the debt and restore the credit line before swiping the card.

4. The credit card limit is limited.

You should know that the cardholder of the main card can set the credit card limit for the secondary card. When the consumption of the secondary card reaches the limited limit, even if there is still an available limit, it cannot be used. At this point, the cardholder of the secondary card can ask the cardholder of the primary card to modify the limit, and then the secondary card can normally spend the credit card.

5, credit card degaussing

If the secondary card is degaussed, or the chip is damaged, so that it cannot be read normally, the card cannot be swiped. At this time, everyone can only ask the host to report the loss of the credit card and reissue it. However, the card number, expiration date and security code of the new card are different from those of the original card.