i am trying to figure out how to get lxsession running on i3. i want to use lxpolkit as my user authenticator and have no idea how to do that. do i start lxsession with xinitrc or the i3 config?
you probably use dex , it start gnome-polkit ?
if you install lxsession-gtk3 as example , just start in autostart with /usr/bin/lxpolkit die the config in ~/.config/i3 settings
is that english? 
Try adding lxsession & at your i3 config autostart section.
Also read this:
https://wiki.archlinux.org/title/Polkit
Ringlish lol…lxsession is something else but just adding lxpolkit helps i use sway myself currently added lxpolkit in my autostart
tried it its not working. this is what i have #exec --no-startup-id --autostart lxsession & /usr/bin/lxpolkit.
I see a hash at the start of your line, if you have it exactly as you posted it, then that’s a comment in your config file and will not work, remove the hash if any. Try it like this:
exec --no-startup-id lxpolkit