Character Added and prompt game pass purchase doesnt work?

I wanted to make a shop, that if I click on buy, it will sent the player into the buying screen and when its bought, he is walking faster, but when he respawns, he loses his faster walk. Please help me!

local Marketplace = game:GetService("MarketplaceService")
local Player = game.Players.LocalPlayer

script.Parent.MouseButton1Click:Connect(function()
	Marketplace:PromptGamePassPurchase(Player, 9586786)
end)


Marketplace.PromptGamePassPurchaseFinished:Connect(function(purchased)
	if purchased then
		Player.Character.Humanoid.WalkSpeed = 40
	end
end)

game.Players.PlayerAdded:Connect(function(plr)
	if Marketplace:UserOwnsGamePassAsync(Player.UserID, 9586786) then
		Player.Character.Humanoid.WalkSpeed = 40
	end
end)

game.Players.PlayerAdded:Connect(function(plr)
	if Marketplace:UserOwnsGamePassAsync(Player.UserID, 9586786) then
		Player.Character.Humanoid.WalkSpeed = 40
	end
end)

local Players = game:GetService("Players")

Players.PlayerAdded:Connect(function(player)
	player.CharacterAdded:Connect(function(char)
		if Marketplace:UserOwnsGamePassAsync(Player.UserID, 9586786) then
			Playerz.Character.Humanoid.WalkSpeed = 40
		end
	end)
end

local id = YOUR_ID_HERE
 
game:GetService("MarketplaceService").PromptGamePassPurchaseFinished:Connect(function(plr,ido,purchased)
    if purchased and ido == id then
        plr.Character.Humanoid.WalkSpeed = 30 --player walk speed (change if you want it higher
    end
end)
 
game.Players.PlayerAdded:Connect(function(plr)
    plr.CharacterAdded:connect(function(char)
        if game:GetService("MarketplaceService"):UserOwnsGamePassAsync(game.Players[char.Name].UserId, id) then
            char.Humanoid.WalkSpeed = 30
        end
    end)
end)
--Make a gamepass and copy and paste ID into the top

Try this, it should prompt them to buy a speed gamepass then give them speed

Could it be because of your connection? If yes then instead of CharacterLoaded use CharacterAppearanceLoaded as it's better.