Setup Ensure that your site is available globally (e.g. use ngrok) Register with the Airnotifier service ( https://apps.moodle.com/ ) Navigate to Site administration -> Messaging -> Mobile Put the Airnotifier access key in place Ensure that the setting `message_airnotifier | encryptnotifications` is on Ensure that you have a course with the following enrolled: Your admin user A student user Login to the site on the app using a student account Open the "Messaging" app Choose the "Settings" cog icon Ensure that the "Mobile" checkbox is ticked Install the .apk file (available in MDL-76722 ) in two Android devices. Login with the student account in the app in both devices. On the site as the admin, send a private message to the student account Confirm the expected notification message arrived on both mobile device and you can read the text (it doesn't appear encrypted).