Changing a rigs humanoid description to the players character, not working?

Making another character customization thing again and I wanted to create a GUI where the player is changing the hair and etc of their original design on roblox,

so I decided to make a rig that would copy the players character through humanoid description when they joined (its only one player per server once their done making their character they get teleported to the actual game)

its a normal script inside a dummy

wait()
game.Players.PlayerAdded:Connect(function(player)
    local humanoid = script.Parent.Humanoid
    local playerId = (player.UserId)
    humanoid:ApplyDescription(game.Players.GetHumanoidDescriptionFromUserId(playerId))
end)

theres no errors in the output either so im not sure why it wont copy the players humanoid description to its own