Gamepass Walkspeed giver, refusing to work?

Not sure, any help? I'm using the new gamepass call functions..

local MarketplaceService = game:GetService("MarketplaceService")
local Players = game:GetService("Players")

local gamePassID = 836664  

local function onPlayerAdded(player)
    local hasPass = false

    -- Check if the player already owns the game pass
    local success, message = pcall(function()
        hasPass = MarketplaceService:UserOwnsGamePassAsync(player.UserId, gamePassID)
    end)

    -- If there's an error, issue a warning and exit the function
    if not success then
        warn("Error while checking if player has pass: " .. tostring(message))
        return
    end

    if hasPass == true then
        print(player.Name .. " owns the game pass with ID " .. gamePassID)
        player.Humanoid.WalkSpeed = 30
    end
end