Hello,
Thank you for contacting Rank Math and bringing your concern to our attention. I’m sorry for any inconvenience this issue may have caused you.
I’ve tried checking your site using Facebook Debugger Tool, and it is showing a cURL error.

Please get in touch with your web host as this issue seems to be coming from your website’s SSL.
Once done, please clear your website’s cache and let us know if the issue still persists.
I hope that helps. Thank you, and looking forward to your update.
did u try this url without m.FB ( mobile FB )
https://www.facebook.com/freevstplugns/
Hello,
Thank you for keeping in touch with us.
I checked your website posted on that Facebook page and I can note that there are no image previews to the posted URLs.
As my colleague discussed, it seems you have issues with your SSL certificate. I checked your website in an HTTP status checker and I can see the error. Please see the screenshot below:

Please contact your hosting provider for this.
Thank you.
Are you using WP rocket in your WordPress? You should to turn off Image fetch option. I did the same for my page.
Hello,
Thank you for getting back to us
Upon checking the page here which you linked, it does not seem to be using Rank Math even when it comes to generating the required meta tags for social media like Facebook and Twitter. However, this page does generate the image on Facebook.
The WP Rocket should not have anything to do with the way images and other OG Meta graphs are fetched on Facebook. Not unless there is image caching within its settings.
However on your other page here: there seem to be an SSL certificate issue which deems to be invalid.
It could be a common issue where the certificate is not trusted in all web browsers. You may need to install an Intermediate/chain certificate to link it to a trusted root certificate.
To quickly fix this issue you will need to consult your host provider team to help you with this.
Hope this was helpful. Kindly let us know if you have any other questions.
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.