Export H5P from Moodle

Hello everyone,

I've created a H5P activity in my Moodle course (latest Moodle Version). Now I want to embed the H5P activity on another external website. For this I copy the code and implement it as iFrame on the external website. The problem is, that it doesn't appear. I have created my Moodle course as a guest course so that it is public and is accessible to guests without login. The problem can't be on the side of the external website because I've already created H5P activities in Wordpress and embedded them successfully on the external website. I suspect it's because of some Moodle settings.

Has anyone ever had this case or can help me out?

Thanks in advance!