My Xbox controller with fully updated firmware is connected via Bluetooth as confirmed by a solid white light on the controller, and the system shows as connected:

Further more, xpadneo is installed as described at https://github.com/atar-axis/xpadneo

But, when I try to use the controller or test it with https://gamepadtest.com/, the controller is still not "detected".

What else do I need to do to get the controller to be detected?