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
It also happened in one of our servers.
Webmail didn't have a valid vhost entry, so I tried:
/usr/local/psa/admin/bin/websrvmng -a
And rebooted apache.
It solved the problem.