Volumetric Shadows not working

For a long time i was not using UE. My last game was released back in 2017. Anyway…
In UE 5.5 i created just a sample map to learn UE5 again.

I use the High Fog and a Spot light. In both i activated volumetric fog and on the spot light the cast volumetric shadows. In the project render settings i activated everything what is related to that too.

Long story short, volumetric shadows won’t appear. There is no shadow in the fog. But every other shadows (on the ground and so on).

No matter what i set up, there are no volumetric shadows. I tried UE 5.4 too, it’s the same.

I used raytracing and no raytracing.
I also watched to UE tutorial for it. I have no luck.

Can anyone give me a hint? Or is this just a bug?

P.s. All drivers are up to date. I use a Rtx 4060Ti 12GB. Intel i9 14700F. … (All actual games run like a Charme, CP2077 in pathtracing on psycho and Full HD)
I don’t think it’s my hardware.