I understand you had to make some changes at BIOS level to get audio working on your system.
If you own an Intel® NUC, please provide the model number so I can check BIOS documentation or manuals. If this is a third party computer, BIOS/UEFI information would be provided by the computer maker.
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Nothing more to do here really. I got the audio to work. It's just that it's like "Play blindly with setting X, reboot, check audio, repeat, intermittently reset to factory and start again". Drivers are not very verbose when things don't work and rarely if ever point to a bios setting. Not a user friendly experience. As noted it was AMI BIOS, just Intel hardware.
Thank you for taking the time to update this thread.
I am glad the HDMI audio is working on your computer. I understand driver installation sometimes is not user-friendly. I have been there as well. Sorry for the bad experience.