Quiz H5P Integration causing permission issues (access denied)
Just ran into this, it might be my setup only but sharing this in the event anyone else may run into the issue.
It looks like the Quiz H5P submodule in the Quiz Module conflicts with H5P. When this module is active, I was unable to view any h5p nodes - was getting false 403s.
Disabling the quiz h5p integration module fixed the issue.
Tested with: Quiz 7.x-4.0-rc1, Quiz 7.x-5.0-beta-3, and quiz_h5p 7.x-5.0-alpha (from here: https://www.drupal.org/project/quiz_h5p).