The most common failure point is the Steam client attempting to force a configuration profile that conflicts with the game’s native expectations.
Dynasty Warriors 9 has a detection priority bug. It often detects "Device 1" as the primary input. If you have the following connected, the game may assign control to them instead of your gamepad: dynasty warriors 9 pc controller fix
Action: Unplug all non-essential USB devices before launching the game. The most common failure point is the Steam
For users utilizing DualShock 4 (PS4) or DualSense (PS5) controllers, DW9 often fails to recognize the device as it natively seeks XInput (Xbox) protocols. Dynasty Warriors 9 has a detection priority bug