It is MANDATORY to match the registered site for your eBay shop and the country site you selected for markdown manager.

It is easy to recognize the eBay site for a specific listing. However, the registered site for eBay shop is not with a single glance.

Each eBay account has its own registered country, but you can sell your product to many country sites within a single eBay account.

Go to Tools > Designer > Store Designer, click eBay store view, you may find out where you’ve registered for your eBay accounts.