Error Code 8556 | Sorry, this product is ineligible for Amazon Marketplace selling at this time

This error indicated that Amazon has detected that the GTIN you are using is already listed on an existing item and is also in a category that you have not been approved to sell in.
Please check that the GTIN you have entered and category is correct. The most frequent cause of this error message is a typo. After checking that you have entered the correct GTIN try again and if the problem persists get in touch with us at contact@barcodebird.co.uk