If you're struggling to connect your Etsy account for the first time, or are having troubles after trying to re-authenticate your Etsy account you are not alone.
"This application has limited access, and the user you are logged in as does not have access to this application. If the error persists, you should contact the application's original author."
We've contacted Etsy developer support and are awaiting their resolution on the matter.
In the mean time, do not try to re-authenticate any of your Etsy stores. If possible, avoid resetting your password on Etsy which may trigger them to erase your existing authentication keys.