Linkedin sharing urls / not parsing open graph

My very first suggestion is appending a meaningless query to the URL, so that LinkedIn thinks it's a new link (this doesn't affect anything else) i.e.:

http://example.com/link.php?42 or http://example.com/link.html?refid=LinkedIn

If that doesn't suit your needs, a more drastic measure is in order.

After making sure you don't have any errors in your console and validating your site using: http://validator.w3.org/...

Add the prefix attribute to every tag (not to html tag), then re-sign in with your LinkedIn account to clear the cache...

prefix="go: http://ogp.me/ns#" i.e.:

<meta prefix="og: http://ogp.me/ns#" property="og:title" content="Title of Page" />
<meta prefix="og: http://ogp.me/ns#" property="og:type" content="article" />
<meta prefix="og: http://ogp.me/ns#" property="og:image" content="http://example.com/image.jpg" />
<meta prefix="og: http://ogp.me/ns#" property="og:url" content="http://example.com/" />

I hope one of these three solutions works for someone. Cheers!

I checked again my html and found some warnings/errors in metadata. I fixed them and all work good. So the solution if you encounter the same problem:

Check your html again and debug it. Even if the page load well in your browser, the LinkedIn parser is not as powerful in terms of small errors. This tool might help.