1. The bank where the bank card you selected is located has not cooperated with Taobao. This rejection
2. You didn't open the online payment function in the bank. Now you can open your own online banking, but only with inquiry function. You need to sign a contract with the bank to have the payment function. This rejection
Another possibility is that the mobile phone number you left in the bank is different from the one you enter now. In this case, you have to go to the bank to change your mobile phone number first.
4. Your bank card is in the state of loss reporting. You need to take your ID card to the bank to decouple.
5. Your bank card exceeds the payment limit. Check whether the bill exceeds the limit.