eBay listing error - before you can list this item we need some additional information to create a seller's account

This error simply means you haven't finished setting up your eBay seller account to be able to list to it.

Please go through this process and ensure you have fully set up your eBay seller account, then you can publish your listing from SynCommerce again to have it successfully published.

Contact support at customer-success@syncommerceapp.com if problem persists.