The export log reports a message like this one:
Inconsistency for the product XXX-YYY(0/1) - The EAN/UPC code(4000005280510) seems wrong. Skipping product.
In most cases, unless exempted, EAN code is mandatory to export to the marketplaces.
EAN field for your product is certainly wrong, it does not correspond to an EAN code issued by the GS1 organization, enter a valid EAN code, example:
EAN codes created by EAN code generators are not valid, they are not accepted by Amazon. It is the same for UPC codes.
Please refer to PrestaShop, EAN codes and Marketplaces post in our blog about the subject.
You must also enter an EAN code per combination if you’re using combinations. See Validate your catalog structure page to know more about the subject.