Moodle 3.9.11+ was recently installed in Azure Cloud. The installation was not an easy ride because Moodle was not prepared to install the application behind an SSL proxy. You may find the solution for this here: Installing Moodle using SSL Proxy.
I started to use Moodle then I realize that I cannot add an activity or resource. And this is something that without this feature Moodle is useless. So first of all, I checked the Javascript console on the client-side and I’d found that some of the Javascript could not be loaded because the response was 403 Forbidden.
The error message was:
Failed to load resource: the server responded with a status 403 (ModSecurity Action)