Deffered Technical Preview greyed out and not able to toggle it on AMD Gigabyte HD 6950 OC x3 Windforce, a DirectX 11.2 GPU with Shader Model 5.0.

Deferred shading works with DirectX 12 gpus with shader model 5.1 and newer and OpenGL ES, on mobile devices.

Tried with a couple PBR packs like:

-Vanilla RTX
-Defined PBR 1.2.0
-PrizmaRTX 1.2.1
-Elys PBR v1.1.0

All of the packs worked on Android, but none on Windows PC.