I'm told that they don't work for visitors with "Limited Visitor" permission setting.
I sure hope this is unintended and will be fixed soon, especially for something that cost $$$$$ to get. I don't want to have to choose between all visitors being able to adjust every interactable (i.e. lighting) and people being able to use the mundus stones.
@Hiyde GM/Founder - Bleakrock Barter Co (Trade Guild - PC/NA) | Blackbriar Barter Co (Trade Guild-PC/NA)