I am not from Intel and I don't know how to solve your problem, but section 1.9 of that NUC's TPS
says that the TRRS connections from tip to sleeve are L/R/Ground/MIC
Wow!! thanks so much! i can confirm microphone and plug no problem, I'll find the problem in the system. This is a great help to me.
I’m glad to hear that the information provided by dougho works for you, you can also see the some Audio devices tested with this NUC at: