The 8566 error on Amazon means “duplicate ASIN” and occurs when trying to create a new listing under an existing ASIN.
To resolve the error, you need to identify the existing ASIN associated with your product and list it under that ASIN.
If you can’t find the correct ASIN, contact Amazon Seller Support for assistance or create a new product that’s significantly different from the existing product.
Comply with Amazon’s policies and guidelines to avoid errors or violations that could impact your account health.
