iFrames from Drupal not working anymore
Hi, This is more of an answer in case somebody is having the the same issues I had.
If you are using Drupal 7 to manage your H5P content and then using the iFrames created by H5P in other sites, it's probable that in your next update of the D7 core they will stop working.
In D7 version 7.50 it was introduced a setting called 'X-Frame-Options: SAMEORIGIN'. This prevents the site from being embedded in an iframe on another domain. Wich meas the H5P and any other iframes from the site won't show up. Here's the link that explains how to revert that or add exceptions to it. https://www.drupal.org/node/2735873