Hello,
We apologize for the issue you are facing with the thumbnail image not displaying. Here are a few things you can check to troubleshoot this problem:
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Check Open Graph Image Settings: Ensure that you have set the default Open Graph thumbnail in Rank Math. You can do this by going to WordPress Dashboard → Rank Math → Titles & Meta → Global → OpenGraph Thumbnail. Make sure to click on Add or Upload File to set your image and then click Save Changes.

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

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Check Individual Post/Page Settings: Make sure that each individual post or page has a custom Open Graph/Social Preview image set. You can do this by uploading a featured image or using the Rank Math Meta Box in the WordPress Block Editor sidebar.


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Image Format and Dimensions: 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, or AVIF). If the dimensions are too small or too large, social networks may not read your image correctly.
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Facebook App ID: Although optional, adding a Facebook App ID can help with sharing issues. You can set it under WordPress Dashboard → Rank Math SEO → Titles & Meta → Social Meta.

If you’ve checked all these settings 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
Hello,
Thank you for contacting us and sorry for any inconvenience that might have been caused due to that.
Could you please share any affected URLs with us so that we can check the issue further for you?
Meanwhile, please try to follow the steps from this guide and see if that works for you: https://rankmath.com/kb/open-graph-image-not-displaying/
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.