Cannot get image to appear when posting page link in Facebook and Twitter

Hello, Most of my pages won’t show an image when I post a link in facebook. I am using Yoast SEO and  have resized the image in my index to be 1200×630 per recommendations, still no go. I have tried with many pages. https://girlsgo.us/change/ This one showed an image yesterday, but is not again. I don’t know if this has to do with caching,SSL,  a setting at Facebook or our theme. Might you have any insights or experience seeing this. Please see my attachments for details.

They include: The app (1736036759969946) specified in fb:app_id meta tag is not published yet. App attribution will be disabled when shared stories are rendered. Please check the status in the app settings.

I have reviewed the recommendations here http://www.wpbeginner.com/wp-tutorials/how-to-fix-facebook-incorrect-thumbnail-issue-in-wordpress/ with no luck.

Thanks for any help, Karen