I'm having problems launching UE4 in DX12

I’m having no luck initialising UE4 into DX12

Followed a handful of routes now so not quite sure what else I’m missing here?
My Windows Version is 1903
dxdiag states I have DX12


I’ve also tried adding a shortcut as shown in this video (UE4 - Introduction to Realtime Raytracing (RTX Overview) - YouTube) so renaming the UE4Editor.exe shortcut to have " -DX12" in there but each time i check in the corner it’s showing it’s using DX11…

I have attached some screenshots to show some details.