ERROR: HTML format isn't supported
The most likely reason why you're receiving this error is because your Shopify store is protected with a password. As a result, Facebook is not able to access the data for your Product Catalog feed. To resolve this issue, please disable the password page from your Shopify store.
To disable the password page for your Shopify store:
- Log in to your Shopify Store
- Click "Online Store", then click "Preferences"
- Scroll down to the "Password page" section, then uncheck the box next to "Enable Password page".
- Click "Save".