Hide Windows 10 Task Manager from Lock Screen

We are using group policy to hide Task Manager from the Lock Screen however, it still shows up for some reason. I even tried a reg hack to turn it off with out any luck. Is there something else we can try? (this happens on all computers and on some it goes away then comes back randomly)
Windows 10 x64
LVL 2
CityInfoSysAsked:
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McKnifeConnect With a Mentor Commented:
Take ownership, first, then give yourself full access, apply and then modify user permissions. Works here.
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JohnBusiness Consultant (Owner)Commented:
What might you have done?  Task manager does not start by itself on Windows 10 (or 8.1). It does not show up on any client lock screen I am aware of.

Are users trying to run Task Manager?
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McKnifeCommented:
Task manager cannot be started without being logged on. You can't be talking about the lock screen.
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CityInfoSysAuthor Commented:
I meant the screen that comes up when you hit ctrl+alt+delete.
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JohnBusiness Consultant (Owner)Commented:
You cannot hide Task Manager from that. That may be the ONLY way you have to recover from something. Don't do that or one day you will not be able to gracefully recover from something.
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McKnifeCommented:
So you want to keep users away from task manager? Why not modify ntfs permissions of taskmgr.exe?
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CityInfoSysAuthor Commented:
That's a good idea however, under the security settings for taskmgr.exe it is grayed out so I can't make the changes.
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CityInfoSysAuthor Commented:
Thanks that worked.
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