Object and PerBone Motion Blur

i’m trying to figure out how to activate (or increase the effect of) Object and perBone Motion Blur.

I did find the setting for perBone (and activated it) - no effect.
But not even wohle objects moving around show any motion blur at all.

The only thing I managed to do so far, is increasing the motion blur effect in the camera settings - but that’s not what I want. In fact the camera movement should not have any motion blur applied to it.

I obviously did miss something, since this seems pretty basic. Could someone please point me in the right direction? Thanks!