Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature currently requires accessing the site using the built-in Safari browser.
If you are still using CentOS 7.9, it's time to convert to Alma 8 with the free centos2alma tool by Plesk or Plesk Migrator. Please let us know your experiences or concerns in this thread: CentOS2Alma discussion
You need to check all related service plans (include service plans that were created under reseller accounts) that the permission 'Hosting settings management' is granted.
Turns out client already had that permission and wasn't doing it (they were expecting it to be an option upon initial sub-domain creation - which, it really should be!)