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 a listing is pushed with a duplicate child product OR a child variant with an identical name. Remove the duplicate or rename the child variant and try listing again.
In the examples below we have two separate child variants that share the name "On the Go Girl - Pink Shimmer":
You can resolve this error by clicking "Remove" on the duplicate you wish and then publish the listing.