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
Have you a WordPress admin URL hider plugin, that will break this from working. You will need to disable plugins like easyhidelogin or other similar plugins to allow that to work.
Are there any errors in Plesk logs? Could you also check response to HTTP request sent when you submit the form at "Network" tab of developer console in your browser?