I have exactly the same issue.
Featured images don’t appear when I share my pages.
When I post one page on Facebook for instance, or send the link of the page to someone, I don’t see my featured image but sometimes the logo of my website, some other times the square favicon and other times nothing at all, just the copy.
So, what’s the use of the featured image on pages if if doesn’t appear anywhere?
To make things clear, featured images DO APPEAR ON POSTS.
It seems problem is not solved for neither of us here.
