I'm using this Intel NUC10i5FNK (released in Q4'19) with a Creative GigaWorks T20 Speaker Series 1, which are indeed working (checked them on another NUC from a former generation running the same Ubuntu 20.04 LTS).
The sound over bluetooth by using earphones however does work.
I'm using the line-in box in front of the nuc as with the other nuc I tested them today.
In the settings/audio there is only "dummy" for output. What could cause the issue?
From some inputs from Hex-Chat the issue seems to be that Ubuntus Kernel of LTS 20.04 has some problems in addressing the hardware.
I finally found this thread:
Thanks for the link.
Even if nuc isn't dell this works for me, add "options snd-hda-intel model=dell-headset-multi" to "/etc/modprobe.d/alsa-base.conf"