How can I make this Double Jumping Script work in a Filtering Enabled Game?

Hello! I was trying to add this double jumping script of the Roblox Wiki to a map of my game. When I tested it in Roblox Studio it worked fine. I had a script in the map that when the map spawns clones a copy of the double jumping script into the Starter Character Scripts. During the round I could double jump and shortly before the end the Script destroyed the Double Jump Script.

But when I wanted to test it in the normal Roblox Client it didn't work. I know it has to do something with remote event or the place where i put the script. It is not a local script - How can I get it to work in Roblox Client as well as in Studio?

local UserInputService = game:GetService("UserInputService")
local localPlayer = game.Players.LocalPlayer
local character
local humanoid

local canDoubleJump = false
local hasDoubleJumped = false
local oldPowerlocal TIME_BETWEEN_JUMPS = 0.2 local DOUBLE_JUMP_POWER_MULTIPLIER = 1.5
function onJumpRequest()
    if not character or not humanoid or not character:IsDescendantOf(workspace) or
     humanoid:GetState() == Enum.HumanoidStateType.Dead then
        return
    end

    if canDoubleJump and not hasDoubleJumped then
        hasDoubleJumped = true
        humanoid.JumpPower = oldPower * DOUBLE_JUMP_POWER_MULTIPLIER        humanoid:ChangeState(Enum.HumanoidStateType.Jumping)
    end
end

local function characterAdded(newCharacter)
    character = newCharacter
    humanoid = newCharacter:WaitForChild("Humanoid")
    hasDoubleJumped = false
    canDoubleJump = false
    oldPower = humanoid.JumpPower 
    humanoid.StateChanged:connect(function(old, new)
        if new == Enum.HumanoidStateType.Landed then
            canDoubleJump = false
            hasDoubleJumped = false
            humanoid.JumpPower = oldPower       elseif new == Enum.HumanoidStateType.Freefall then
            wait(TIME_BETWEEN_JUMPS)            canDoubleJump = true
        end
    end)
end

if localPlayer.Character then
    characterAdded(localPlayer.Character)
end

localPlayer.CharacterAdded:connect(characterAdded)
UserInputService.JumpRequest:connect(onJumpRequest)

Script by Roblox Wiki