Why is my phone saying can’t verify server for ellingalsoil.one

You probably got tricked into installing a rogue calendar; your phone does not have a virus. In the future beware of "free" offers

See this Apple support link→Delete spam calendars and events on iPhone - Apple Support

or watch this companion video:

Delete Calendar Spam

Go to Settings/Calendar/Accounts/Subscribed Accounts and delete it from there.

I habe this problem too but I don’t have the calendar app installed so i don’t know what to do