I figured out that, they ask about my Payoneer bank account which I have added before in my associates account as payment method to withdraw my commissions.
They mentioned the last 4 digits of this account in their second email regarding this issue.
Check your Payoneer us bank account number if it ends with these numbers, generate bank statement of any month that includes Amazon affiliate payment which has the last 4 digits of your bank account. Or there is an option that Payoneer generate something like statement including your name, address and account number.