Why isn't this ProximityPrompt firing?

I've been at this for almost an hour now and have no idea why it doesn't work.

-- clone is a model duplicated from serverstorage

for i, part in pairs(clone:GetDescendants()) do
    if part.Name == "primary" then
        local prompt = Instance.new("ProximityPrompt")
        prompt.Name = "BoxPrompt"
        prompt.RequiresLineOfSight = false
        prompt.HoldDuration = 4

        prompt.Parent = part

        prompt.Triggered:Connect(function(plr)
            local char = plr.Character
            print('triggered!!!!!!!!!!') -- doesn't print

            -- some more extra stuff that really doesn't matter
        end)
    end
end

I'm gonna go to sleep, it's almost 2am and I want to die.