Sound in player GUI wont play?

A sound isn't playing when I step on the block meant to trigger it. There aren't any output errors, and experimental mode is on so filtering enabled shouldn't be a problem. Here's the code. EDIT: It works in studio just not online

local part = script.Parent
local players = game:GetService("Players")
local played = false

part.Touched:connect(function(hit)
    local char = hit.Parent 
    if char.Humanoid and played == false then
        local plr = players:WaitForChild(char.Name)
        plr.PlayerGui.Sounds.windows:Play()
            played = true
            wait(5)
        end
end)