UPDATE:
Having followed the WIKI on how to identify the IR-KEYTABLE that is used by the NUC and to create a list of ScanCodes, the INTEL NUC IR uses rc6-mce.
LibreELEC (official): 9.1.502 (Generic.x86_64)
LINUX:~ # ir-keytable
Found /sys/class/rc/rc0/ (/dev/input/event5) with:
Name: ITE8708 CIR transceiver
Driver: ite-cir, table: rc-rc6-mce
lirc device: /dev/lirc0
Supported protocols: lirc rc-5 rc-5-sz jvc sony nec sanyo mce_kbd rc-6 sharp xmp imon rc-mm
Enabled protocols: lirc nec rc-6
bus: 25, vendor/product: 1283:0000, version: 0x0000
Repeat delay = 500 ms, repeat period = 125 ms
LINUX:~ #
After doing a Full Button Function RAW ScanCodes by ir-keytable -t it appears that the VolumeUP / VolumeDOWN / Mute / APP buttons do not have an output code that is recognised by the Intel NUC IR Sensor.
WORK-AROUND:
Still using the Sony Input to have the URC7935 Streamer communicate with the Intel NUC J5005, I trained the URC7935 to operate the TV volume control by having the URC7935 learn from the TV Remote Volume Buttons.
The APP Buttons (Netflix / Hulu / Youtube / Amazon) buttons also do not have an Output Signal, so they might be something that is not supported by the RC6-mce driver and therefore is not supported by the NUC.
The FastForward / Rewind buttons are working, I probably was not noticing that they were not a Long Hold to skip to area of video wanted, but needed to multiple button press to FF / RW for Speed to skip.
Hope this helps others that are interested.
If you want to see the Button RAW Source ScanCode, let me know and I can either upload it, or copy and past the txt here into the thread.
PS.
I also got a reply email from One-For-All Support this afternoon and the email stated that the Volume Control buttons were reserved for TV / Sound Bars Etc and were not configurable to work with the Intel NUC which is possibly why the APP buttons also have no output and may be using a Different Protocol that is not supported by the NUC.
Regards,
Craig
Thank you for your patience.