PLEASE NOTE: eBay errors are common. If your item is showing "Failed to List" after attempting to list, you can learn more by clicking on the item receiving error to see what eBay is asking from your listing under 'eBay Status'.
This error occurs when something has gone wrong on eBay's end. The mostly likely cause is because eBay business policies are not properly set up. For more on how to set up your business policies, see this article.