My CyberPanel host domain is dhanmondi.lonesock.pro. I can issue ssl for lonesock.pro (for web) and when I am trying to issue mail server SSl for lonesock.pro this msg is happening: Could not connect to server, please refresh this page.
For your information: I have applied mail server ssl for dhanmondi.lonesock.pro before and that was issued. But after reading the doc, realized that was a mistake.