Hi healinghand - just to be very clear as I don’t believe your question was fully understood by st10ss.
You need to connect to the AXR4T through one of the Thunderbolt 3 ports (USB-C) on your Thunderbolt card. Do you have a Gigabyte Titan Ridge card? The other mini DP ports on the Titan Ridge card are not actually Thunderbolt 2 ports but display ports meant to rout video signal to the card (to facilitate running video through the thunderbolt connection).
In short you need both a thunderbolt 2 cable and also a Thunderbolt 3 to Thunderbolt 2 adapter. In my experience the Apple adapters actually work well.
Note: Thunderbolt 2 cables and miniDP cables are not the same even though they look the same. Same with Thunderbolt 3 and USB-C.