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
I think it might be happening due to the following reasons:
1. Expired or installed invalid SSL certificate
2. Misconfigured SSL certificate
3. System date and time discrepancies
You can check out this article for more details and troubleshooting steps: How to Fix NET::ERR_CERT_AUTHORITY_INVALID...