To remove duplicates from your product feed, enter the advanced command:
If you find this isn’t working, refresh the feed page by hitting ctrl + F5 or Ctrl+r . Your browser may be holding your previous feed in its cache.
Most of the times, when you are creating aggregate feeds or creating feeds after updating products, this command will come to use.
If you have any confusion about removing duplicates from product feed, please feel free to contact our support team.