Hi @Paul G
As there is no troubleshooting guide for this I would recommend giving feedback directly to Microsoft through feedback:
https://feedbackportal.microsoft.com/feedback/forum/ad198462-1c1c-ec11-b6e7-0022481f8472
If you are running Pulse Audio you may want to look into:
P.S. PulseAudio seems to trip-up when audio devices are unplugged/plugged in. I submitted a bug report for this behavior and received a reply that basically it's a known, upstream issue. Until this behavior is ironed out, I basically don't unplug my headset. In my case, I'm ok with it because I don't use any external speakers anyways, but if my headset does get unplugged, I just plug it back in, reboot, and I'm back to where I need to be.
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If this is helpful please accept answer.
@Paul G
It has been a while, how is everything going?
If you have any update about this issue, please feel free to post back.