First make sure all plugins are up to date under SiteAdmin -> Plugins. Mobile must have v188.8.131.525 or later.
1. If you have a Cloud server or a Google Maps key from GpsGate that is all you need to do.
2. If you have a Standard Plan you need to add the following referrers in Google Cloud Platform Console:
3. If you have a Premium Plan you need to add the following referrers in Google Cloud Support Portal