Difficulty with featured images from publishing site in Facebook

hey all. I don’t know if this is the right space for this question, but i’m on an inquiry-mission to figure something out. I recently created a subdomain called “publishing-dot-intothemythica-dot-com” within my intothemythica url and have been using a service called Craft which allows for publishing across the internet. Problem is, when I try to share the url (which is within publishing-dot-intothemythica-dot-com) I get an error and lose the featured image when sharing to Facebook, which makes no sense as it works fine on iMessage and other things. Does anyone have a sense of why this would be happening and if it’s related to the Cloudflare account?