Logitech Flight Throttle Quadrant - In Use

When I try to activate the Logitech Flight Quadrant, the client says:

"There was an error using this device"

The server logs state that something on the server is using the device, but I don't have any other applications open.

2020-06-14 20:23:34 ERROR :Cannot capture device because it is currently in use at the server. Please exit the program that is using the device, then try again. (USB\VID_06A3&PID_0C2D\7&1C28E04C&0&4)
2020-06-14 20:23:39 ERROR :Cannot capture device because it is currently in use at the server. Please exit the program that is using the device, then try again. (USB\VID_06A3&PID_0C2D\7&1C28E04C&0&4)
2020-06-14 20:23:39 ERROR :Error binding device 9 [06a3:0c2d] to connection 2, BIND_ERROR

How can I find out what is using it?