WhatsApp will use the site icon if no og:image tag is set. You don’t currently have anything setting og:image tags, but most plugins which do so will set the featured image as the og:image tag.
Here are a few plugins that do that:
https://wordpress.org/plugins/jetpack/
https://wordpress.org/plugins/wordpress-seo/
https://wordpress.org/plugins/og/
Thread Starter
Anna
(@webowl)
Thank you James. I do have Jetpack installed. Where and how do I put in the og:image tag?
Thanks in advance
WebOwl
If Jetpack’s sharing buttons https://jetpack.com/support/sharing/ or Publicize https://jetpack.com/support/publicize/ modules are active, Jetpack should add open graph tags automatically.
Thread Starter
Anna
(@webowl)
I activated Publicize, even though I did not connect to any social media platform, and it worked. The featured image now shows up in WhatsApp shares. Amazing. THANK YOU, James!