Ok, this is surely not the Driver4VR problem. I can’t test joycons/perform any calibration in Windows/Gamepad settings too (attached). Both controllers are detected, but keys/sensors are not working.
I also tried BetterJoy, it detects joycons perfectly, “Locate” button is working (vibration).
So, I’m not sure why this is happening. Is it related to Bluetooth adapter/driver?