Thanks for the suggestion, I can have audio output from HDMI with the
following now by playing an audio clip instead of noise:

$ sudo amixer scontrols
$ sudo amixer set Master 100 unmute
$ sudo amixer set IEC958 100 unmute
$ sudo aplay -D plughw:0,7 /var/snap/alsa-utils/common/file_example_WAV_2MG.wav 
-v

** Changed in: snapd
       Status: Incomplete => Invalid

** Changed in: linux (Ubuntu)
       Status: Confirmed => Invalid

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https://bugs.launchpad.net/bugs/1879630

Title:
  No sound output from HDMI audio

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