Why is Lumen not working?

Why is Lumen not working in Unreal Engine 5.0, 5.1, 5.2

1. Switch your project to Deferred rendering to use all Unreal Engine features such as Lumen GI and Nanite particularly.
2. Disable the quad view to make Lumen and Unreal Engine postprocess work.

Disabling quad view in Unreal:

The temporary work-around is to change the code of the project by removing XR_VIEW_CONFIGURATION_TYPE_PRIMARY_QUAD_VARJO

from line:

https://github.com/EpicGames/UnrealEngine/blob/4.27/Engine/Plugins/Runtime/OpenXR/Source/OpenXRHMD/Private/OpenXRHMD.cpp#L56

and by removing the line: 

https://github.com/EpicGames/UnrealEngine/blob/5.1/Engine/Plugins/Runtime/OpenXR/Source/OpenXRHMD/Private/OpenXRHMDModule.cpp#L463

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