M3 Button not working in Wayland

Mouse M3 button not working in wayland - ubuntu 26.04

1. Check your desktop

Run:

echo $XDG_SESSION_TYPE
echo $XDG_CURRENT_DESKTOP

2. If you are using GNOME

Enable middle-click paste:

gsettings set org.gnome.desktop.interface gtk-enable-primary-paste true

Check it:

gsettings get org.gnome.desktop.interface gtk-enable-primary-paste

It should return:

true

Done.