Third party Xenforo links doesn't get resolved in Facebook

Sure!

This is what it looks like:

not_resolved.webp

Normally there is a logo for my site showing up to the left together with a preview of the post to the right.
 
As Mike said, all XenForo does is provide the link to FB, which obviously works in a browser.
All the magic happens on their end so there's nothing that can be done about it.
 
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