Welcome to the Question2Answer Q&A. There's also a demo if you just want to try it out.
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DISPLAY ERROR CODE : Can't Load URL: The domain of this URL isn't included in the app's domains. To be able to load this URL, add all domains and subdomains of your app to the App Domains field in your app settings.

closed with the note: Unrelated to Q2A. Read FB documentation to learn how to setup the plugin
still cant i have read all documentation and comfirmed setup is correct