PDF View not working at my page

Hi, I have an inline embedding of my PDF in that page and I see the PDF in previewmode. However, when I when I see the page as an external visitor, I see only the headline but not the PDF. Any Idea where the issue could come from?

The DIV of the ADOBE ID is visible but it's essentially emtpy in the frontend.

Here's the URL: https://erfolgreich-freelancer.de/finanzverwaltung-e-book-testleser