It appears to be a compatibility problem, you may need to try updating to the latest Thunderbolt™ Firmware Update.
Please try download it from here
Check instructions at: https://downloadmirror.intel.com/26141/eng/Thunderbolt-Firmware-Update-Guide.pdf
I have version 18.05 already installed. I have updated the BIOS and drivers as well.
Does the NUC have the required power for the adapter through USBC? According to the manufacturer, it is 15W of bus power. The adapter is the Startech TBT3TBTADAP.
Special notes on their page provide the following information but I am unable to find this information on the NUC anywhere.
This adapter is compatible with Thunderbolt™ displays only. It will not work with Mini DisplayPort (mDP) or DisplayPort (DP) monitors.
Any host system that doesn’t provide the full 15W of bus power won’t work with this device. Consult the manufacturer of your host system to determine how much bus power your host system provides.
Thank you for the information.
I have confirmed the following features:
What's supported via Thunderbolt™ 3 on Intel® NUC Kit NUC6i7KYK?
- 15 watts device power—hubs, hard drives, and audio interfaces
- Single 4K (Ultra HD) or 1080p video support (via DisplayPort 1.2)
- Daisy-chaining up to six devices
- External graphics card (Razer Core*)
- Up to 40 Gbps transfer speeds
- USB 3.0 and 3.1 protocol
- Thunderbolt networking
Motu have tested the Startech adapter with the Motu 828x and it works. They would not have tested it with a heap of different computers though. I have also used the Motu 828x via standard USB with the NUC. From the Intel side of things, is there any reason that you can see why there would be a compatibility issue between the Intel NUC and the Startech adapter?