The provided condition id is invalid for the selected primary category id

eBay has specific conditions that are allowed for each category of item.

For example, new, refurbished, or used are common conditions for many categories, but some categories may have additional or specific conditions, such as “certified pre-owned” for vehicles.

In this case, you need to check for the category of the product in error and pick a condition allowed inside the Nembol “list to eBay settings”

You can find a list of allowed conditions per category on the eBay website at this link.

Some of the products that returned the error have no category, in this case, add a category by opening the products > relist them.