Facebook Preview/link not working

Jetpack and YoastSEO recently updated for me, and now my Facebook Share button is playing up. For all blog posts before the two updates, the Facebook share button still works as normal but for this page: https://letsnotthink.com/what-they-dont-tell-you-about-university/ it doesn’t.When I press the Facebook share button, I don’t get a preview of the article and instead of linking to the specific post, I just get a link to the home page. I’ve put the page url into the Sharing Debugger tool and I get this: The ‘og:image’ property should be explicitly provided, even if a value can be inferred from other tags. I’ve tried deactivating Jetpack, Yoast SEO and Sassy Social Share individually and together, but nothing seems to work, not even disabling the ‘Add open meta graph data’ in Yoast SEO. Yoast SEO say they can’t help and Jetpack said to contact Sassy Social Share. What do I do?

The page I need help with: [log in to see the link]