There may be many reasons why Ping An Credit Card cannot be used. The following are some possible reasons:

1. Credit card problems: Check whether the credit card has expired, whether the credit limit is full, whether it has been frozen, etc. If the credit card has expired or the limit is full, it may not be possible to withdraw money.

2. Banking system problems: There may be malfunctions or maintenance in the banking system, resulting in the inability to issue credit cards normally. It is recommended to wait for a while and try again.

3. Merchant issues: Some merchants may restrict certain types of credit cards or credit cards from specific banks for payment. Confirm whether the merchant accepts Ping An credit card payment, or try other payment methods.

4. Network problem: There may be a problem with the network connection that prevents the credit card from being swiped out. Check whether the network connection is normal, or try to use another network environment for payment.

If the above conditions are eliminated and you still cannot withdraw a Ping An credit card, it is recommended to contact Ping An Bank customer service or merchant customer service to inquire about the specific reasons and seek solutions.