Enable "Mobile Notifications" when a site is registered

Requirements for testing: Ngrok Testing: Install a new site with this branch Give the site a public internet site address (URL) using Ngrok As admin, access to the site using the public URL Go to Site administration -> Messaging -> Notification settings and check that you see the "Mobile" plugin enabled (checkbox with a tick) just under Notifications plugins Click on the Settings link in the "Mobile" row Go to the bottom of the page and click in the "Request access key" link and confirm that: You see an error "Your site is not yet registered" Now, click on the "Register your site" link just at the right of the error 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 Go to the bottom of the page and confirm that: The "Airnotifier Access key" field is not empty Copy that key somewhere else (in a notepad or somewhere else) In the same page, remove the "Airnotifier Access key" field content and click Save changes Now click in the link "Request access key" and confirm that: You successfully retrieve the access key and it is exactly the same you annotated before Once you have finished testing, you can unregister the testing site via Site administration -> Registration and them clicking "Unregister your site" link at the bottom