I have had this issue for awhile now and have been doing as much research as I can to figure out what the cause is. I was hoping the WordPress SEO update would fix it, but no luck.
One interesting thing I noticed is this blog post on one web host has the same error we are talking about:
https://equalmotion.com/landscapes/new-york-cityscapes/
Error: “Object at URL ‘https://equalmotion.com/landscapes/new-york-cityscapes/’ of type ‘website’ is invalid because a required property ‘og:title’ of type ‘string’ was not provided.”
I took the same site and put it on another host and everything worked fine:
https://bodyboardculture.com/equalmotion/?p=2312
I checked with the host and they are not doing anything that would be preventing the issue and actually directed me to this post and here I am.
These Facebook previews are huge for me since my site is photography based.
If anyone has any ideas I am more than open to do more testing and try different options.