"Critical virus alert Virus detected!" pop up on my iMac
I am getting an obnoxiously persistent pop up notification with an Apple Settings gear icon and message stating "Critical virus alert Virus detected! Activate your Antivirus. My antivirus program finds no virus. Sometimes the pop up says that my iCloud account has been hacked. How do I get rid of this pop up malware since Virus One and Cleaner One Pro are not eliminating it?
This is on my MacBook.
[Re-Titled by Moderator]
iMac 27″ 5K, 13.1