Some of these settings are hidden or managed by your organization message showing on Privacy Settings page

I finally resolved the problem I was having today, involving using the Local Group Policy Editor.  As far as I understand, this is available on Windows 10 Pro, not the Home edition.  Hopefully this will help a few of you.

• Press Windows key + R to open the 'Run' window.  Type gpedit.msc and press enter.
• Under Computer Configuration, expand Administrative Templates, then expand Windows Components.
• Click on App Privacy.  Double-click on the relevant issue, e,g,. if you cannot use your webcam, double-click on 'Let Windows apps access the camera'.
• On the left under Options, there should be a 'Default for all apps' setting.  In my case this was set to 'Force Deny'.  Change this to 'User is in control', then click OK at the bottom.
• Click on the Start button, click Settings, then click Privacy.  Hopefully the relevant permission button is no longer greyed out.

You are correct.  The group policy editor is not available in the Home version. 

Pro users has other tools as well to fix this. Like system center.

Home users can reset policies by using powershell commands. Pro users can do this as well.

The group policy editor is just a tool that uses the cmd/powershell commands. (Why those tools are not in win 10, I dont understand)

Microsoft released 2 days ago problems in 20H2 with exectly this.

Resetting the PC does work. But only because you reset your policies with that. Thats like buying a new car when you get a flat tire ;).

Here is how you fix the problem of "managed" when your PC IS NOT MANAGED!!! (Some are).

1. Open a powershell or cmd windows (With Admin rights)How to open a cmd or powershell windows.- Click start - Find Windows Powershell folder in the application tree.

• RIGHT CLICK on the Windows powershell that only say powershell (Not Powershell ISE, x86).

2. Choose open with admin rights.

3. Copy all these commands. And paste them into the powershell

reg delete "HKCU\Software\Microsoft\Windows\CurrentVersion\Policies" /f

reg delete "HKCU\Software\Microsoft\WindowsSelfHost" /f

reg delete "HKCU\Software\Policies" /f

reg delete "HKLM\Software\Microsoft\Policies" /f

reg delete "HKLM\Software\Microsoft\Windows\CurrentVersion\Policies" /f

reg delete "HKLM\Software\Microsoft\Windows\CurrentVersion\WindowsStore\WindowsUpdate" /f

reg delete "HKLM\Software\Microsoft\WindowsSelfHost" /f

reg delete "HKLM\Software\Policies" /f

reg delete "HKLM\Software\WOW6432Node\Microsoft\Policies" /f

reg delete "HKLM\Software\WOW6432Node\Microsoft\Windows\CurrentVersion\Policies" /f

reg delete "HKLM\Software\WOW6432Node\Microsoft\Windows\CurrentVersion\WindowsStore\WindowsUpdate" /f

4. Reboot your system. <---skip this and it does not work

Check the setting that had "managed by" in yellow text. If its gone = fixed and its policies you change with a tool that creates a registry mix that Microsoft yet have to fix.

If you are still "managed", then I suggest Malware removal operation. Then contact Microsoft support. They will help you.