Hi Lanavededante,
You can read the same topic like yours in this link
The other solution might work is manually start Unreal Engine with DX11 without changing the default RHI in Project Setting.
I’d tried both ways and all works, but I think it’s better leave the project setting in DX12.
But I still don’t know the consequence by manually start with DX11, will all the feature that only work in DX12 won’t be run or it will be crashed the engine if I force it to run. 