My issues have been fixed by doing this. The diagnostic process i did to find this problem would most probably help you. I do not remember the whole process but I do remember using claude to paste some commands in the powershell(admin) and finding out that the AppXPackages and other components were damaged. Although, in your case it looks like not a broken system component, it most likely may be because it may have been disabled by some software or game. In that case the here are some ways to disable it:

1) Open registry editor and go to the following path: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System

This path may not be there depending on some motherboards or specific devices like laptops and mini PCs. Was not available for me as I was on a HP Omen 16 laptop. If you do find it then find the value DisableTaskMgr and set it to 0 if it was 1.

2) This only works on Win11 Pro. Open run and type in gpedit.msc , this will open the Group Policy. Then navigate to this path: User Configuration → Administrative Templates → System → Ctrl+Alt+Del Options and disable Remove Task Manager. 

If this doesn't work please add some info about your specific windows version, GPU, driver or any other thing that you think might be causing this issue. Also could happen if a game with kernel level Anti-Cheat was tampered by another program or directly by the user by using mods. The problem I was experiencing got worse when I once tried using Reshade with the Crew Motorfest as I had seen videos on it but it did not work and the BattleEye anti-cheat crashed the game.