@owend
I would never have solved it by myself. I really appreciate your help. Thank you so much.

Hi,
I have a problem with filament detection.
Board: Duet2 wifi
RRF: 3.4.0
Filament sensor: simple microswitch (3 wires V G S) connected to "e0_stop"
Printer: Anycubic Predator
Looking at the E0 led in the board, when filament is loaded the led is ON when the filament is not present the led is OFF
Unfortunately in the Tools part of the web interface, under Tool 0, I have the message T0 - Load Filament even if the command M591 D0 find the filament loaded.
I think there is something wrong in my config.g file, but i have no idea what could be.
Here is a picture of the web interface, and my config.g file
Thank you for your help.
config.g