Post Thumbnails Problem

Hello Bosses.

My post thumbnails doesn’t show whenever I share to social media. I have changed themes, uninstall all plugins, still no solution.

It started when I changed my domain. Please help me on what to do its really frustrating.

Namecheap is my host and I can’t switch host now that it has not expired.

so which image shows when you share your posts?

Thanks for the response. It doesn’t show any image just a blank space.