Windows 10: get message "Windows defender antivirus is turned off and is currently being managed by...

As it states above I have notification telling me Windows defender anti-virus is turned off but I cannot change this because my system admin is blocking me. This is on my private laptop and I am the system admin. I'm not part of an organisation.

:)

 

"Windows Defender Antivirus is turned off and is currently being managed by your system administrator"

I have been getting a notification for the past couple of days. It reads "Windows Defender Antivirus is turned off and is currently being managed by your system administrator" The grey button that says Turn On Now right beside this message is greyed out.
How do I fix this? Why am I not the system administrator? Weird stuff. Can someone please help me. Lynn

* Original title: windows 10 - Antivirus

 

Defender AntiVirus

There are 4 options under Defender. Two refer to AntiVirus; AntiVirus Network Inspection Service & AntiVirus Services. Under Startup Type these two are listed as manual and the Status column said Inspection Service is running. When I clicked on the Start
button in Properties, I got an immediate message: "Win.. Def.. Anti.. Serv.. on local comp.. started and then stopped. Some services stop automatically if they are not in use by other services or programs."

 

Can't turn on Windows Defender Antivirus

After freshly installing Windows 10 N and doing a few initial restarts to finish all updates, I cannot turn Windows Defender on anymore. After pressing "Turn on now" under Security and Maintenance at Virus protection, I get this message:

Security and Maintenance can't turn on Windows Defender Antivirus. Please try again later.

I tried disabling the "Turn off Windows Defender Antivirus" in policy editor, but that did not solve the problem. I also can't even open the Windows Defender Security Centre and I haven't installed any other antivirus.