Lume pad hdmi audio out issues

I bought a usbc to hdmi multi port hub.
it works with the lume pad but i only get video no sound on my tvs, a few tested.
the tablet shows a headphone icon so it looks like the tablet thinks there are usbc head phones attached
vs hdmi audio. i tried some apps that say they can toggle the output but none work as needed. with one 3rd party app i can toggle sound back to the tablet speakers but not to hdmi.

i hope this can be corrected in a fw update. its a nice option to connect this to a tv.
also some sbs or other 3d modes would be great.