Different item asked on Amazon GBP

GrayComp

Hi, i just registered to this platform to help me receive payments from Amazon Kindle Direct Publishing. I have succeeded adding the receiving account for US, but i am facing issue in adding the GBP one. It asked me for IBAN number and BIC/SWIFT code, while Payoneer provides me the Account number and Sort code instead. I tried to put Sort code as SWIFT code, and account number as IBAN, but it does not work (not enough characters).
Does anybody know how do I solve this?

thank you!!