HDRI - not supported for baking?

I am missing something here…
When I use the new HDRI Backdrop - I thought it’s going to use this information also for my bake?

After doing the entire build - and deploying my scene to the Oculus Quest.
Everything appears black.

Does this mean, HDRI and Sun/Sky is not supported?
Or … does it mean… I am missing something major here?

thanks a lot for any help!
appreciate it!