Requirements for testing: A site with public internet site address (URL) over HTTPS using ngrok. Mobile app Setup Login as admin using the public URL. Go to Site administration -> Mobile app -> Mobile settings. Select "Enable web services for mobile devices". Click "Save changes". Go to Site administration -> Messaging -> Notification settings and check that you see the "Mobile" plugin enabled (checkbox with a tick) just under Notifications plugins Testing scenario 1: Moodle site Go to the Site administration -> Messaging -> Notification settings > Mobile settings > Check and test push notifications configuration Confirm that: You see three errors: Notification server (Airnotifier) configuration, Airnotifier access key and User devices The "Default notification preferences" check is set to Warning The rest of the checks are ok Now go to Administration -> Site registration And complete the registration process by accepting the "Privacy notice" and clicking "Register your site" button Once the registration process finishes, go back to the Site administration -> Messaging -> Notification settings > Mobile settings > Check and test push notifications configuration Confirm that: All the checks are OK except the last two ones that are Error for "User devices" and Warning for "Default notification preferences" Testing scenario 2: Mobile app Access as admin with the Moodle mobile app to the site Close or put in background the Moodle mobile app in your device Go back to the Moodle site "Check and test push notifications configuration" page and confirm that: The last check (User devices) says OK Click "Send test push notification to my devices", Accept the confirmation message and verify that: You receive a Push notification in the device Testing scenario 3: Critical error Go to Site administration -> Messaging -> Notification settings Disable the Mobile plugin Save changes Go back to the Moodle site "Check and test push notifications configuration" page and confirm that: You should see a critical error in "Enable mobile notifications" The "Send test push notification to my devices" button should be disabled