Hello,
We apologize for the issue you are facing with the Open Graph/Social Preview Image not being displayed. Here are some steps you can follow to troubleshoot and resolve this issue:
1. Set the Default Open Graph Image
You can set a fallback Open Graph thumbnail by navigating to WordPress Dashboard → Rank Math → Titles & Meta → Global → OpenGraph Thumbnail. Click on Add or Upload File to set your image and then click Save Changes.

2. Set Open Graph Image for Homepage
If your homepage is set to display your latest posts, you can change the homepage Open Graph thumbnail under Rank Math SEO → Titles & Meta → Homepage → Homepage Thumbnail for Facebook.

3. Check Image Dimensions & Format
Ensure that the image you are using meets the recommended dimensions of 1200px X 630px and is in a supported format (JPEG, PNG, GIF, WebP). If the image dimensions are too small or too large, social networks may not read your image correctly.
4. Configure Facebook App ID (Optional)
Although this is no longer necessary for Facebook Insights, you can still add a Facebook App ID to remove warnings from the sharing debugger. Go to WordPress Dashboard → Rank Math SEO → Titles & Meta → Social Meta to set your Facebook App ID.

5. Check Added Facebook/Twitter Sharing Images
Make sure you have added Facebook/Twitter sharing images through the Rank Math Meta Box for your posts/pages.

If you’ve followed these steps and the issue persists, please reply to this ticket, and a human agent from the Rank Math Support team will assist you further. Thank you for raising this concern!
Sources:
Open Graph/Social Preview Image Is Not Displayed » Rank Math
thanks.
Now I follower your step finished OpenGraph Thumbnail setting.
But Nest step:Set Open Graph Image for Homepage, I can not find the Homepage more info details
pls check the below
https://imgur.com/a/aMNaIEM
Hello,
It looks like you’re using a static page for your homepage. In this case, you can directly edit the meta tags from the Rank Math SEO Meta box: https://rankmath.com/kb/homepage-meta-title-and-description/#edit-your-homepage-directly
Hope that helps and please don’t hesitate to let us know if you have any other questions.
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.