In AH, in options, controls, map controllers, scrollbar at the top lists whatever controllers are seen.
ie if you have a joystick it will show MS Sidewinder Joystick, mouse should also be listed.
Does it list your gamepad?
If it doesn't, go into windows control panel, make sure its calibrated in Windows first.
Ie not just "come to life" but is seen and recognised (and calibrated) in windows.
Once thats done, then come back and try it in AH again.
If that doesn't do it, then I'm afraid its tech support, or give up and go buy a cheap stick.
Saitek ST-290's have everything you need to fly well. 3 axis including rudder, throttle, hat switch, and a few buttons.