Why don't featured images appear on social media posts?

I can add featured images to posts and these images will show up on some social media (e.g. LinkedIn) but not on others (e.g. Facebook and Twitter). I am just wondering if I am doing something wrong or if its related to the post options themselves?

Here is an example of a how a post in on our website and how it shows up on Facebook): https://streetnet.org.za/we-are-looking-for-a-media-assistant-join-our-team/