USB SPDIF Configuration?

[TheOldPresbyope]

Out of idle curiosity, what do you see if you invoke alsamixer from the command line?

Does it show the HDMI sound card is not muted?

Regards,
Kent

Not sure how to get to the command line.  Will I need to hook up a display and keyboard to the Pi?

Well, you can, or you can connect via ssh from another computer, but the easiest way is to enable moOde's builr-in web SSH function and then open the SSH terminal.

Go to m>Configure>System, scroll down to Security and look at the settings.

Regards,
Kent