"Dummy Output" for HDMI audio output

Fresh install of Linux Mint Cinnamon 22.1 on a repurposed Asus Chromebox 3 (CN65), bluetooth headset works fine (detects it property and audio works), detects HDMI (shows all 3 ports I’ve tried on monitor), but displays “Dummy Output” under Device in sound settings. Audio output port also doesn’t work, tried ear buds on it. Web cam and mic input work fine. Just the HDMI and audio port isn’t working…

I ran the
git clone GitHub - WeirdTreeThing/chromebook-linux-audio: Script to enable audio support on many Chrome devices script, still shows “Dummy Output” for HDMI…

Tried to run the debugging script, but apparently not smart enough to figure out how to attach to my topic…

Any help would be appreciated.