Summary: Disabling lock screen using gpedit or registry editor triggers some settings are managed by your organization warning in lock screen settings.
This is what happens when you disable lock screen in Windows 10 using group policy editor (happens when you done through registry through also): when you visit Lock Screen section in Personalization of Settings, you’ll see a warning message that some settings are managed by your organization and options to change lock screen background and everything else in the page gets grayed out, let us see how to fix this.
Undoing the change
1. Open the run dialog box and type ‘gpedit.msc’ (without quotes)
2. Navigate to Computer Configuration > Administrative Templates > Control Panel > Personalization,
3. Double click on ‘Do not display the lock screen’, and set it to ‘Not configured’ from ‘Enabled‘ state.
Now when you visit Settings > Personalization > Lock Screen, that warning or message will no longer appear.
Disabling lock screen in Windows 10 without using group Policy editor
1. Open registry editor by using regedit in Run dialog box
2. Navigate to HKEY_LOCAL_MACHINE > Software > Policies > Microsoft > Windows,
3. Select Windows key, right click on right pane and browse for and create a new key named Personalization
4. Ensure Personalization is selected on the left, right click on the right pane ‘new > DWORD (32-bit) value’, give it the value name as ‘NoLockScreen’ and value as ‘1‘
5. Exit registry editor.
UPDATE: Disabling lock screen through registry also triggering that, so better you shouldn’t disable lock screen thing to don’t that get message.