I think the user needs to be a member of the group "sys" in the /etc/group file, try that and a few other of the important sounding groups, I would try it for you but I havnt had time to install nix on my Desktop yet, my laptop is Dead and I dont really want to turn off my Server
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NS
And easier way is if you have a `/etc/shutdown.allow` file, is put the persons username in there.
NS