Open graph not working

It's not you, specifically. I'm seeing similar errors from *some* online tools.. others are able to fetch your page. The tools below can't seem to scan your page either:
tools.seobook.com/server-header-checker/
www.webconfs.com/http-header-check.php

I'd recommend the following steps:
* In the Joomla Global Configuration area, set the "Enable Gzip Compression" setting to "No". This has been known to cause issues with some automated tools in the past
* Check the server logs of your site when those tools fetch your pages to determine what errors may be happening

I hope that helps get you started,
Alex

Glad to hear you got things going. If you run into anything else, just let us know. It's what we're here for!

Finally, if you haven't already, please consider leaving a rating and review for JFBConnect, or our support, on the Joomla Extension Directory. It's certainly not required, but very appreciate:
extensions.joomla.org/extensions/extensi...l-display/jfbconnect

Thanks,
Alex