1. Banking system maintenance: During the regular maintenance and upgrade of the banking system, the use of some functions will be suspended, resulting in the inability to bind. It is recommended to wait until the banking system is well maintained before trying to bind.

2. Abnormal bank card status: the bank card has been frozen and cancelled for various reasons, so it cannot be bound. It is recommended to contact the customer service of the bank to find out the status of the bank card. If there is any abnormality, you need to go to the bank counter to solve it.