Hello,
Thank you for contacting Rank Math support, and sorry for any inconvenience that might have been caused due to that.
I checked your website and currently the og:image tag isn’t generated.
Please head over to your WordPress admin area > Rank Math > Titles & Meta > Global Meta, and set a default OpenGraph Thumbnail for your website to fix this issue.

Please set the image of the recommended dimensions (i.e, 1200px X 630px) and of the supported image types (jpeg, png, and gif).
You can also set the social images for individual posts/pages/CPTs.
Please refer to these guides for more details:
https://rankmath.com/kb/meta-box-social-tab/
https://rankmath.com/kb/titles-and-meta/#open-graph-thumbnail
Hope this helps.
Thank you.
I set up default image , but non of my post share image on Facebook.
I got a msg that it was answered, but I do not see the msg from support
Hello,
I checked your posts on Facebook and the link preview is working fine and showing the image set by you:

Please clear the cache of your site and check again.
Let us know how that goes. Looking forward to helping you.
But when I share the post image does not appear. I cleared cache for my site and it did not help. Why?
I flush cache on WordPress manage and purge cache on WP-optimise plugin. It did not help. What else I need to do?
Hello,
Please clear your browser cache too, and try sharing a new post on your Facebook page.
Hope that helps. Please let us know if you have questions.
I cleared all history on my Mac air. when I tried to share old posts it did not help.
Hello,
I checked again and it seems to be working fine:
Check this screencast: https://i.rankmath.com/YAf6ms
If you are using a CDN, clear the cache from there, clear your website cache and try sharing the post again.
Let us know how it goes.
We are here to assist you.
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.