Wanted to update this. Having same problem on Debian Stretch. So it is either a Linux/NUC compatibility issue or the NUC can't handle a USB headset.
Okay, I have partial success. I have an old 4 port USB 2.0 hub (Genesys Logic) that I plugged int one of the rear USB ports. I now have good audio input and output. However, I still can not use the USB extension cable. The cable was purchased within the last two weeks and is supposedly a shielded high quality cable. Perhaps it has too high of impedance. At least I may be on the right path. Will post again if I have a solution. Any comments and/or suggestions are welcome.
This message was posted on behalf of Intel Corporation
It is possible that issue here is related to the NUC not being compatible with these operating systems. I have tested an USB headset on the same unit you have running Windows® 10, but everything worked fine.
Just bear in mind that Intel does not test and validate Intel® NUC on Linux; however we know that a lot of NUC owners are using it successfully on many different Linux distros, and if one of these owners might have tip on how to proceed here, please feel free to join the thread.
Amy, thanks for the response. However, I think you might have missed the last post. The USB headset works, with Linux, if I use an external USB bridge between the NUC and my headset. To me, this may imply that the NUC USB ports don't have sufficient drive capability. However, as I don't have access to the design specs I can only speculate as to the cause. In any case we can consider this closed.