Hi,
even if a api key is configured in the extension settings, it won't be used, because it is commented out:
https://github.com/b13/t3ext-geocoding/blob/1b61fdd7e912b4378a8a1fabcb4fa4e1f5b5c86f/Classes/Service/GeoService.php#L60
Regards,
Uwe Michelfelder