After Amazon became a big reseller, he became very bad to his customers.
you need to sell 3 products using your associate account
BUT, if you from correct country, they help. And your error mean something other. Please recheck your account settings.
Please write to support: webservices.amazon.com/paapi5/documentation/contact-us.html
Do you have plans to modify the component to allow for an associate's link to replace the buy now button?
Not full understand question,
If you use our website book library software
"buy now button" move to link which you see in field: "Buy from link", Please check attachment image.
But if you use "fetch info from amazon " - this link fill automatically, together with another info. Else you need fill it manual. And there you may fill link to any link. But when you fill all info manual, you need select "Fetch information" ->"On your own"