Insert element block using dynamic id

I think it’s how admin-ajax.php handles the request. I don’t think it can fire that hook as it happens outside of the template execution.

I am not knowledgeable with Ajax ( as you can probably tell 🙂 ) – it may require a template to be output inside that loop instead and within that template make the hook callback.

Unfortunately theres not much else I can advise

Let us know if you find a solution!