At checkout it says PayPal payment method is not available when all are set up correctly

Hello, My Wix store has been connected with PayPal (I have a PayPal business account; Status: Active; Message: You are accepting PayPal) but it’s not working. It says on the checkout page “There was a problem with your payment - this payment method is not available right now”. Would anyone help me explain how to fix that. Thanks in advance, HuijuanYU