Installation and server related problems

Hi everyone,

I'm encountering an issue in rendering some H5P core content after upgrading Moodle from 3.11 to 4.3.3.

Symptoms:
- Downloaded the H5P files that not rendering, upload them again to the same Moodle installation as h5p plugin, and it rendered correctly, but not when migrated to h5p core using tool_migratehvp2h5p.
- H5P content appears in the content bank and shows one link.
- Clicking "edit H5P" results in an error shown in the screenshot below.

One of our admin added content bank with Moodle and this was all working with H5P content, but then it stopped working and giving a 504 timeout error.  Moodle community suggested it is a registration issue with H5P.org,

However, neither the Moodle installation instructions on their site or the H5P instructions on this site detail how / where I set the registration so our courses can connect with H5P.org?

The possible issues mentions registration issues, but it only mentions Guzzle and missing CA cert.

Dear all,

On my WordPress site I have created some h5p quizzes I’d like to embed to other pages outside the site domain. Other users tell me that this is not a problem at all, but on my pages I get the error message that the origin/source website has declined the access. I tried embedding the code on one of my other WordPress pages, but get the same error message. I've checked the plugin settings and also tried to grant access by changing the .htaccess file by adding

Header always unset X-Frame-Options