Arnold Only Rendering 1st frame Again & Again

Trying to render a simple test animation using Arnold. render > render sequence.
I get the same frame rendered over and over. In the common tab, I have the frame/animation ext.
set to name#.ext. I tried to use batch render, but that caused an error.

In the Animation Tab did you set a frame range?

Yes, I did from 1.00 —> 20.00 frames

I’m using Active Rigid Body and Passive Rigid Body solvers and a Gravity
Field in the animation…if that matters.

Does it render if you keyframe a cube?
Maybe you have to bake the animation to Alembic.

Does it render the first frame (only the frame 1 is saved as file) or does it render every frames as files but they are all the same?