My Double Jump Button Gamepass isn't Working?

So I have this in a local script in a text button that is in a gui, that is in startergui. The script is supposed make the gui only seeable to the players that own the gamepass and when clicked will give the player a higher jump. It doesn't seem to be working could someone tell me whats wrong?

local player = script.Parent.Parent.Parent.Parent.Parent

if game:GetService("MarketplaceService"):UserOwnsGamePassAsync(player.userId, 4916610) then
	script.Parent.MouseButton1Click:connect(function()
		 game:GetService("Players").PlayerAdded:Connect(function(plr) -- :connect is deprecated, use :Connect

    plr.CharacterAdded:Connect(function(char) -- wait for the character! 
        if isAuthenticated(plr.UserId, passId) then
            char.Humanoid.JumpPower = char.Humanoid.JumpPower + 30 
	    end
	end)
else
	script.Parent.Visible = false
end

Is this your script? What else are you trying to do?

Try not doing that messy local player = script.Parent.Parent.Parent.Parent.Parent just to find the player. Use game.Players.LocalPlayer but in this case we are not client sided at all.

In a Server Script:

--You can/should set services outside of functions.
local Players = game:GetService("Players")
local MarketPlaceService = game:GetService("MarketplaceService")

local gamePassId = 4916610--Your gamepass id

local guiToGive = script:WaitForChild("ScreenGui") --what ever the location is to the gui

Players.PlayerAdded:Connect(function(player)
	if MarketPlaceService:UserOwnsGamePassAsync(player.UserId, gamePassId) then

		--Manage this if I missed something
		player.CharacterAdded:Connect(function(character)
			local gui = guiToGive:Clone()
			gui.Parent = player.PlayerGui
			
			character.Humanoid.JumpPower = character.Humanoid.JumpPower + 30 --probably dont want this hard-coded (make a variable up above).
		end)
	end	
end)

edit: I believe you can use PlayerAdded on client side