Well, I used the googles, and found this link https://davidwalsh.name/facebook-meta-tags which explains that you need to have a <meta property="og:{tagName}" content="{tagValue}"/> with the appropriate values to specify the image used when you share a link to FB.
Lots of options in that meta command, and the article explains it quite well.
Since you used various techniques to (probably) change that meta value, check the generated page code to see what those techniques actually added. You might try looking at the page with a new browser instance (and perhaps using an ‘incognito’ mode) to see generated code.
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