The error means that no UPC/EAN or an invalid value has been entered for the items.
Since 2016, sellers are required to include valid Product Identifiers when listing new and refurbished items in certain categories. UPC (Universal Product Code) and EAN (European Article Number) are international barcodes that are widely used for tracking trade items in stores.
To resolve the error, you have to send a valid barcode value for your products on eBay. For this, please check the following:
UPC/EAN settings in eBay > Configuration > Settings > Main > eBay Catalog Identifiers.
Barcode value in the Magento attributes set as the UPC/EAN source.
If you sell custom-manufactured or white-labeled items that do not have product identifiers, ‘Does not apply’ must be used for the UPC/EAN fields.
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