Help! TB3 HD not working on x570 ITX/TB3

Hello ASROCK gang, please excuse my first post being a request for help. I also have open tickets with Asrock and scan.co.uk where I bought the motherboard, but thought I'd post here in case anyone else is having similar issues connecting their TB3 device to the new x570 mini itx tb3 board.

The following is my copy paste to asrock support, I think I've covered most of my own troubleshooting here. Thanks for reading and any help you may be able to provide.

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I have a thunderbolt 3 hard drive (g-tech shuttle xl tb3) that is not working on my machine. I've bought the motherboard for its tb3 port. I have reinstalled windows several times to get this to work. The system recognises that the hard drive is attached, through the thunderbolt utility. I have installed the latest firmware on the motherboard, as well as all the suggested drivers and utilities from Asrock's website. I have uninstalled and reinstalled them several times as well. All the drivers from G-technology's site are up to date as well.

The drive is connected, on, and recognised by the system (through thunderbolt utility), however it does not show up in the explorer. When I go to 'device manager' and click 'scan for hardware changes', the 'g-technology g-speed raid controller' comes up under 'storage controllers', with a '!' sign. Clicking on this I get the following error: "This device cannot find enough free resources that it can use. (Code 12). If you want to use this device, you will need to disable one of the other devices on this system'. Trying to update drivers does not work (they are most recent), and trying to uninstall driver for this item results in a system crash.

There is also, in device manager, another 'unknown' device that pops up with an '!'. It is under 'Other Devices', and shows up as 'PCI Device'. Clicking on this and trying to update drivers does not work.

Going to 'settings' -> 'devices' -> 'Devices and printers', the hard drive shows up in the list as 'RAID Controller'. I can press 'Troubleshoot', but this does not help (troubleshooting couldn't identify the problem'. The computer has restarted several times during this step.

I know that the hard drive works. I have used it in OSX and Windows 10 via bootcamp on 2 different macbook pros and a macbook air. I have reformatted it to NTFS, to HFS+ (with the appropriate drivers / software utilities installed). So I think the issue is not on the device side.

After several crashes (BSOD) I downloaded 'whocrashed', and ran the analysis. It pointed to a driver called stexstpt.sys, identified as the driver for 'Promise Pegasus Driver for Windows x64'. Really confusing as the Promise Pegasus is a different hard drive from a different brand, and from what I understand it may also be macosx only. So weird.

Thank you for your attention and any help you can provide!