Do I need a Google Maps API key?
Yoast SEO: Local allows you to add two different Google Maps API keys. We will briefly explain why you need them both.
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Google Maps Geocoding server key
The Google Maps Geocoding server key is necessary to translate addresses into geographical locations (latitude/longitude). When you create a new location, Yoast SEO: Local uses the Google Maps Geocoding API.
Without this key, or if it is invalid, your new location’s address will not be translated into a geographical location. However, no error will be shown.
Get your Google Maps API keys
Please refer to the following articles to generate and set your Google Maps API keys.