NUC8i7HVK/ALC700 does not support the audio devices noted:
Intel® NUC Kit NUC8i7HVK
Google: NUC8i7HVK audio problems
Windows: no analog audio, no TOSLINK, no HDMI audio; no solution, 9 months
Likely, macOS/HDMI audio working
Disagree, Device Manager does not show front audio port working; no headphone mic or speaker. Device Manager does not show Optical on rear audio port. By the way, Tweaktown says the NUC has 4 microphones on the front panel panel.
Attach Control Panel/Hardware and Sound/Sound/Playback and...
Windows/Sound or Realtek driver?
Attach Windows supported audio devices screenshot
Cold boot (shutdown, pull power, hold power button in for 30 seconds, restore power)
Reply with new IOReg and Terminal output