Would you mind taking a look at the following areas to ensure that your Facebook account is set up correctly?
Check to make sure your Facebook page is set to the Shopping Template.
Enable the Shop Tab.
Ensure your page is published.
Ensure that there are no Country Restrictions or Age Restrictions.
If all of those areas are set up correctly, and you're still having issues with connecting your Facebook page to Shopify, let me know!
Thank you for checking! We'll want to give it about 24 hours from the time you made the change to see whether this will resolve the issue. If 24 hours pass, and you're still unable to see your products on your Facebook page then let me know.
Thank you for reviewing those steps. In this case, we'll want to escalate your store to our Technical Support for further review. I've sent you an email so we can verify your account and have this sent up.