Whats wrong with this script?

This script is suppose to give players with a certain gamepass sparkles when they join the game. when i play the game it doesn't work, also there are no errors in the output.

local GamePassService = Game:GetService('GamePassService')
local GamePassIdObject = script:WaitForChild('GamePassId')

local function OnCharacterAdded(char)
    local smoke = Instance.new("Sparkles", char:WaitForChild("Torso"))
end

local function OnPlayerAdded(player)
    if GamePassService:PlayerHasPass(player, GamePassIdObject.Value) then
        player.CharacterAdded:connect(OnCharacterAdded)
    end
end

Game:GetService("Players").PlayerAdded:connect(OnPlayerAdded)

Thanks.