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
In my case (plesk 17 on centos 7) I was able to solve this by uninstalling the letsencrypt extension , then running
plesk installer --select-release-current --reinstall-patch --upgrade-installed-components
and installing the extension again