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
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.
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.
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.
Thank you for your patience.