"Tap-to-click" greyed out under "Touchpad" setting

I would like to activate the “Tap-to-click”, “Tap-and-dray” under “Touchpad” setting but these options are greyed out. Is this a know bug? Thanks a lot!

Create:

/usr/share/X11/xorg.conf.d/30-touchpad.conf

Contents:

Section "InputClass"
    Identifier "devname"
    Driver "libinput"
    Option "Tapping" "on"
EndSection
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