Hello,
Thank you for contacting us and sorry for any inconvenience that might have been caused due to that.
This issue usually occurs when Facebook is unable to find any OG image on your pages. We can see some wrong og:image
meta tags are added on your website but not by the Rank Math plugin:

It seems like these meta tags are added by your theme or any other plugin. To determine that, please follow this troubleshooting guide: https://rankmath.com/kb/check-plugin-conflicts/
Also, please make sure you’ve added a Default OpenGraph image in WordPress Dashboard > Rank Math > Titles & Meta > Global Meta > OpenGraph Thumbnail.
Let us know how it goes. Looking forward to helping you.
Thank 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.