If your devices support it, you can use Airplay. I assume you have connected your Beam with HDMI to your projector.
I use Airplay myself from my iPhone and Mac.
You can also use Bluetooth, but I don't recommend that as the sound will be degraded.
I don’t think the Beam has Bluetooth. Does your projector do HDMI-ARC? Or your PC? Would optical from either be an option?
BEAM 2 receives its audio via HDMI-ARC or HDMI-eARC. HDMI audio uses a different set of pins. That’s why you are not receiving any audio. You’d need to use an adapter between the computer and BEAM. These adapters are not easy to find and are usually expensive.
EDIT: Likely the most practical solution is to use a TOSLINK output from the computer or use an HDMI to TOSLINK (optical) converter followed by the SONOS TOSLINK to HDMI-ARC converter.
