Which CMS and player version are you using please?
Basically if you’ve added the api key so the module itself is configured, then I’d expect it to show the specified location as per your configuration.
Preview in layout designer should show it as well, I’m not sure what do you mean that there is no preview option.
In the player, if you’re using windows player, please make sure that that browser emulation settings are correctly added.
I’m happy to look at your layout with google traffic widget if you want to send it to me over private message.