This situation is mostly because you have operated a local store.

Most Chinese sellers open cross-border stores and cannot directly bind a bank card; binding a bank card is an operation for Shopee local numbers. Only by filling in a local mobile phone number and bank card can it be bound. If you fill in a Chinese mobile phone number, it will only prompt that it is invalid.

Shopee cross-border stores need to be bound to one of the three third-party payment methods: PingPong, Lianlian, and Payoneer. You can find the corresponding binding entrance below the bank card. Then you can use a Chinese mobile phone number to register these payment methods, and then bind the Shopee store.