If the Beam is set up correctly, the audio from the Nintendo Switch should already be playing out of the Beam and surround speakers. Although since you only have a Beam (Gen 1) and the Switch uses LPCM audio for surround sound, you will probably just be limited to stereo audio rather than 5.1 audio.

Thanks for the reply… it’s a Beam Gen 2 and the Switch has a surround option in settings… not sure if this changes anything

Set the TV to these settings:

HDMI Input Audio Format: Bitstream

Digital Sound Output: Pass Through

eARC Support: On
 

On the Switch, set TV Sound to Surround.

Thanks much for the info… I’ll give it a try

tried the new settings and it works great… thanks again for the help

Would a beam 2 or Arc get surround from a switch then? 
 

I’ve just got an LG G3 and a bit sad that I’m only getting stereo from my beam 1. But if all it would take is upgrading to a beam 2 that wouldn’t be soooo bad. 

Yes, a Beam (Gen 2) or Arc will allow you to get LPCM 5.1 audio from the Switch.