Footroom lighting during the ride -GP3

So dear people, my 2nd post and need your help again. It’s about the footroom lighting that is supposed to light up via MFA during the ride to the percentage to which it was set. Now my GP3 shows the funny behavior… when more than 0% to 100% light power is set unfortunately but nothing lights up during the ride… When the doors open you shine normally as entry lights and as soon as the door is closed they also go out completely… Does someone know much Eicht what there fails to move the light ? Greet you