Hello, I'm looking for help with my Precision 7520 and its Thunderbolt connector.

I bought an external case for the eGPU Sapphire GearBox for the ThunderBolt3 connector.

Unfortunately, after connecting, the housing is detected as an ordinary USB hub, but it does not see it as a ThunderBolt device, charging does not work, etc.

The case was connected to another Dell Precision 7550 laptop and there it is correctly detected as thunderbolt, i.e. it is visible in the ThunderBolt Control Center software, reports charging with a maximum power of 90W, etc.

So far I have done, updated the thunderbolt module firmware (Dell ThunderBolt Firmware Update 4.46.155.003, A08). I have installed the drivers from the Dell website with the number Intel-Thunderbolt-Controller-Driver_TBT79_WIN_17.4.79.510_A12.

Unfortunately, these drivers are recommended to work with Windows 1909 and old (I have Windows 20H2 64bit).
When I connect the eGPU to the thunderbolt port, the device is not detected.

Therefore, I tried to install the drivers from Intel's website (I found such an entry somewhere on the www forum), and I tried the TBT-Win10-1.41.1193.0 version. Unfortunately, after connecting the eGPU with these drivers, an exclamation mark appears in the device manager next to the ThunderBolt Controller 15D9 device with the error code 43.

On another laptop with Thunderbolt everything works fine, so the eGPU is fine.
How to make thunderbolt work properly?