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 checked your homepage, and it is indeed missing the og:image for your OpenGraph image.
To fix this, please add your default social sharing image under Rank Math > Titles & Meta > Global Meta > OpenGraph Thumbnail

Once done, clear your website’s cache and check again using the Facebook Debugger Tool.
I hope that helps.
Thank you, and please don’t hesitate to contact us anytime if you need further assistance with anything else.
Hello,
I have updated the sensitive data as requested. Can you please check further?
Thank you.
I’ve done what you asked me to do.. but it still not displayed.
Hello,
I’ve checked your site, and the og:image tag is still not showing in your homepage’s source code.
Please ensure that the image file format you are uploading is only between jpeg, gif, or png as per Opengraph Standards.
Also, make sure that your images are using the recommended image size. Recommended image size is as close as 1200 x 630 pixels.
Once done, clear your website’s cache and check again.
If the issue still persists, please follow the steps in this section to check for a plugin conflict on your site:
https://rankmath.com/kb/open-graph-image-not-displaying/#num-3-2-check-the-page-source
I hope that helps.
Thank you.
Thank you for your support. Now, the problem is solved.
I’m using webp image in my post. So that’s why og: image not displayed. As your suggest, I changed the picture format into png and re-checked it on facebook sharing debug. The result, I found the og: image and the picture was showed.
I thought that webp image will make my blog super fast. However, it gives impact to social media sharing.
Hopefully, In the future, I will use webp format and get better score pagespeed.
Thank you so much for your great support.
Hello,
We are super happy that this issue is already resolved. If you have any other questions in the future, know that we are here to help you.
If you don’t mind us asking, could you please leave us a review (if you haven’t already) on https://wordpress.org/support/plugin/seo-by-rank-math/reviews/#new-post about your overall experience with Rank Math? We appreciate your time and patience.
If you have another question in the future, please feel free to create a new forum topic, and it will be our pleasure to assist you again.
Thank you.