"Page not found" error when posting to Facebook

Hey all,

I have setup Facebook Instant articles and everything seems to be in working order, until I go to publish the article on Facebook that is.

The article in question is already under Production Articles as “Live” in the Instant Articles menu under Publishing Tools, and I have disabled other plugins that could be causing a conflict. But when I post the link on the Facebook page it won’t generate the preview, and just says “Page not found” instead.

Any ideas for why Facebook can’t pull the necessary data to generate the preview? Any help would be much appreciated!

https://wordpress.org/plugins/fb-instant-articles/