1. card is not activated:

If you have just received a credit card from China Merchants Bank, you need to activate it before you can use it. It can't be used without activation.

2. Insufficient credit card limit:

If the cardholder spends more than the currently available credit card when swiping the card, it will also lead to the failure of swiping the card.

3, credit card machine failure:

When the cardholder uses CMB credit card to swipe the card, the line of the card swiping machine is busy or fails, which will also lead to the failure of CMB credit card swiping.