How to successfully implement og:image for the LinkedIn

This answer I found on LinkedIn forums might be of help to you:

Guys, I've spent a whole day trying different things. What worked for me is using the mata [sic] tags as following:

<meta prefix="og: http://ogp.me/ns#" property="og:title" content="{Your content}" />
<meta prefix="og: http://ogp.me/ns#" property="og:type" content="{Your content}" />
<meta prefix="og: http://ogp.me/ns#" property="og:image" content="{Your content}" />
<meta prefix="og: http://ogp.me/ns#" property="og:url" content="{Your content}" />

Just try to add prefix to every tag (not to html tag), then re-sign in with your LI account to clear the cache... Post your results.

I found this simple fix which worked for me after lots of complicated solutions which didn't work:

LinkedIn

The only way to “clear” the sharing preview cache for LinkedIn is to trick LinkedIn into thinking your page is a different (and new) page.

This is done by adding a made-up parameter to the link. It doesn’t affect your webpage, but it does force the metadata to be re-fetched.

Example:

Original link: //beantin.se/consultant-resume "New" link: //beantin.se/consultant-resume?1

I was having the same issue last night. Spent hours researching solutions and I tried the solutions recommended by others in this post but to no avail. Finally I contacted LinkedIn about this issue and they responded right away. Their development team has implemented a new tool called "Post Inspector", which allows you to optimize content sharing. Literally, in just minutes this actually worked.

All you have to do is type in your URL and they do all the busy work i.e. verifying correct code of properties such as image, author, title, description, publication date etc. Not only do they verify, they also tell you what code to include, what is missing, and how to fix it.

Here is the website to use Post Inspector:

https://www.linkedin.com/post-inspector/