Problems with creating a tool in game?

local playername = Instance.new("Tool")

function onPlayerEntered(newPlayer)
    if newPlayer:IsInGroup(508662) then 
        local function Chatted(chatmsg)
        if chatmsg:sub(1,17) == "Give Commands to " then
            local player = chatmsg:sub(18, chatmsg:len())
            if game.Players:FindFirstChild(player) then
                local chicken = playername:Clone()
                chicken.Parent = game.Workspace
                chicken.Name = player 
            end
        elseif chatmsg:sub(1,24) == "Take Commands Away From " then
            local player = chatmsg:sub(25, chatmsg:len())
            if game.Players:FindFirstChild(player) and game.Workspace:FindFirstChild(player) and player:IsA("Tool") then 
                game.Workspace[player]:Destroy()
            end
        end
        end
        newPlayer.Chatted:connect(Chatted)
    end
end

game.Players.PlayerAdded:connect(onPlayerEntered)

When I tested it in ROBLOX studio, the tool with the player's name was created perfectly fine. However, in-game, the tool seems to not be created whenever I call the function. Does anyone have a reason why it works in studio, but not in game? If so, could you correct the mistake in my script? Thanks in advance.