HD Native Thunderbolt 2 / 3 not recognized

[Porky]

Hi all, just completed this build but very confused about the Thunderbolt connection. The motherboard has 2 TB3 (USB-C) connectors, but using an "Apple Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter" my HD Native TB (Omni) isn't recognized. Are these "display port only" connections? I'm sure I'm missing something.

Thanks in advance.

I built this off recommendations from a PT Expert build, but they're using an RME USB interface.

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Intel Core i9-9900K Coffee Lake 8-Core, 16-Thread, 3.6 GHz (5.0 GHz Turbo)

GIGABYTE Z390 DESIGNARE LGA 1151 (300 Series) Intel Z390 HDMI SATA 6Gb/s USB 3.1 ATX Intel Motherboard

Ballistix Sport AT 64GB (4 x 16GB) 288-Pin DDR4 SDRAM DDR4 2666

EVGA GeForce RTX 2070 Black GAMING, 08G-P4-1071-KR, 8GB GDDR6, Dual HDB Fans