Reversing light not working

Hi, when I put my car peugeot 206 1.4 diesel in reverse gear, the reverse lights do not turn on, the rear view camera does not turn on, does anyone know how to proceed, thank you.

reverse switch is faulty.

At first I thought it was the reverse gear switch, both the lamp was not on and the mileage indicator was ridiculous, the reverse camera was not working, the source of the failure was only one 10 fuse, the problem was fixed when it was changed.