LinkedIn Sharable Website Image not working in Angular5 Project

I am currently hosting my Angular5 project on a Firebase Host Server. But, when I try to paste the url into a link on LinkedIn it does not show an image. I followed the LinkedIn documentation and added a metatag to my index.html in angular.

<meta content=";v=4" property="og:image" />

I then ran ng build --prod again followed by firebase deploy again to update my webpage. But, it still does not show the image when I add a link to LinkedIn, what is the problem?