Based on build 44579 under windows 11
The switch allow keyboard joystick set to enabled properly blocks keypresses from being sent to the keyboard, but it doesn't work as joystick movements.
I have ensured that the keymapping is set properly and I have tried both numeric as well as keymap a and b to both joysticks, but none of them result in a joystock movement.
Also the visual aid in the lower status bar also doesn't indicate any joystick movement.
Can anyone with Windows 11 test this? It works fine on Windows 10.
I have tested this on Windows 11 myself: everything works as expected: keyset A and B can be assigned to and mapped to a joystick, indicators work and joystick input works, numpad also works.