There is a few things you can try to verify:
- Make sure the camera works with the original software for the logitech brio (where you can change camera settings etc.)
- Before starting the Calibration Tool, make sure to close any software which might be using the camera output (logitech calibration program hogs the camera, making it not work in calibration tool)
- Use the directional arrows in Calibration tool (not sure if up + down or left + right) to change video input device to use logitech brio
If none of these steps work for you, maybe you can elaborate on your specific situation more?
Cheers