windows 10, missing checkbox "Users must enter a username and password to use this computer" on User Accounts screen.

1.  open regedit
2. goto HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\PasswordLess\Device
3. double click: DevicePasswordLessBuildVersion 
4. change from 2 to 0
5. reopen User Accounts screen
6. see checkbox appears "Users must enter a username and password to use this computer"