For the record, your thumbnails have to be larger than 50x50 before Facebook will recognize them in your yoast
seo social settings for open graph meta tags...
Change your thumbnail size in the
Wp-Admin to 150x150 px. Settings>Media - thumbnail size
I set mine to 150x150, didn't try any smaller ones...
I researched a ton of crap and it turned out that this was my stupid problem ...