mod background colors on welcome screen and the entire login

Until recently the accent win8.1 reg worked fine but now there no way to do this without getting default blue color where in registry do i switch it to black and how?

this entry

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\Personalization]
"NoLockScreen"=dword:00000001
"PersonalColors_Accent"="#00b8ff
"PersonalColors_Background"="#000000"


works on th2 and anniversary edition but not rs2