UserOwnsGamePassAsync() Not working right?

Hi, So i been making this weapon spawner script and you prob saying how does it work? well when a player who owns the gamepass says the command in the script "/sg revolver" a text appears saying they have spawned a weapon and how many more they have left to spawn. If they don't own the gamepass and say the command nothing happens and weapon wont spawn. So the thing is that it isn't working how isnt it working? May you be asking well the thing is that any player can spawn it and i only want the players that own the gamepass to be able to spawn the weapon. Please Help

 function onChatted(message, player)
    if message == "/sg revolver" and game.MarketplaceService:UserOwnsGamePassAsync(player.UserId, 18855590) then
        if player.Limit.Value > 0 then
            game.ServerScriptService.KostanaPack.Revolver:Clone().Parent = player.Backpack
            player.Limit.Value = player.Limit.Value - 1
            player.PlayerGui.SpawnerViews.Spawner.Enabled = true
            player.PlayerGui.SpawnerViews.Spawner.TextLabel.Text = "You have ".. player.Limit.Value.."/15 guns left to spawn!"
            wait(2)
            player.PlayerGui.SpawnerViews.Spawner.Enabled = false

        elseif player.Limit.Value == 0 then
            player.PlayerGui.SpawnerViews.Spawner2.Enabled = true
            player.PlayerGui.SpawnerViews.Spawner2.TextLabel.Text = "You have no guns left to spawn"
            wait(2)
            player.PlayerGui.SpawnerViews.Spawner2.Enabled = false
        end
    end
end

game.Players.PlayerAdded:connect(function(player)
    player.Chatted:connect(function(message) onChatted(message, player) 
    end)
end)