Why is my reserve server event getting the error "unable to cast value to object"?

I am attempting to make a script that teleport all the people on a brick to a certain server. It goes completely fine up until we get to the reserveserver event where it then shows an error "HTTP 403 (Forbidden)"

local TweenService = game:GetService("TweenService")
local TeleportServce = game:GetService("TeleportService")

local OpenTeleportUI = game:GetService("ReplicatedStorage"):WaitForChild("RemoteEvents").OpenTeleportUI
local UpdateTeleportUI = game:GetService("ReplicatedStorage"):WaitForChild("RemoteEvents").UpdateTeleportUI

local GameId = 4815315578

local debounce = false

local CloseDoor = TweenService:Create(script.Parent.Parent.MovingDoor,TweenInfo.new(2.5,Enum.EasingStyle.Linear,Enum.EasingDirection.In,0,false,0),
    {Position = Vector3.new(395.354, 76.527, 18.753)}
)

local OpenDoor = TweenService:Create(script.Parent.Parent.MovingDoor,TweenInfo.new(2.5,Enum.EasingStyle.Linear,Enum.EasingDirection.In,0,false,0),
    {Position = Vector3.new(394.924, 76.527, 9.341)}
)

local currentPlayerTable = {}

script.Parent.Touched:Connect(function(hit)
    if hit then
        if hit.Parent:FindFirstChild("Humanoid") then
            if debounce == false then
                debounce = true
                wait(.5)
                local player = game:GetService("Players"):GetPlayerFromCharacter(hit.Parent)
                OpenTeleportUI:FireClient(player)
                table.insert(currentPlayerTable,player)
                local P1 = currentPlayerTable[1] 
                local P2 = currentPlayerTable[2]
                local P3 = currentPlayerTable[3] 
                local P4 = currentPlayerTable[4] 
                UpdateTeleportUI:FireAllClients(P1,P2,P3,P4)
                if #currentPlayerTable == 1 then
                    local ReserveServer = TeleportServce:ReserveServer(GameId)
                    for i,player in pairs(currentPlayerTable)do
                        wait()
                        print("player"..player.Nmae)
                        TeleportServce:TeleportToPrivateServer(GameId,ReserveServer,player)                 
                    end                 
                end
            end
        end
    end
end)