Thank you for the quick response.
The problem is not the plugin (I realized) but the fact that Etsy not approving the API key requests (so I was trying to use a PENDING API key). API key requests are Pending then they are just rejected by Etsy (even though this is just for the plugin).
Do you have any suggestions regarding “a how-to” when applying for the Etsy API key?
Thanks for your time.