Camera: Controller works in Unity - but not on a android device

Hi,
I´m a starting greenhorn in Unity and I do have problems bringing my FlyCam +OrbitCam onto my android device. It´s for a cardboard presentation which is ready. And that is why I need a controller to control the cameras.
The goal is using the joystick for a simple left right forward backward camera move. Rotating should happen through looking around - direction change with the head of the user.
I use the "MS Camera Controller" script of Marcos Schultz which fits pretty fine for me as far as I see. My controller is a 8BitDo and I can control/influcence the four camera move directions that I need like described before.
Problem: It only run at PC not at the device.
Are there special things in the playersettings I have to have a look on?
Are there mistakes in the input settings?

Has anybody an idea/impulse how to fix that issue?

Cheers, SB

The controller I did test on the device (Redmi Note 5) with a keyMapper app - works fine.
The attachement shows my test scene.
Sry. for my poor english...

 

Nobody any idea?
Salve SB...