As stated in this article, Google Maps now requires an API key before it can be rendered properly on the 'Contact Us' page.
To obtain the key go to this link, scroll down to the 'Authentication for the standard API - API keys' paragraph and click on the 'Get a key' button
Create a new project and click on 'Create and enable API'
It will take up to a minute to generate the code. When that's done, it can be copied over to the 'Enable Google Maps Integration' option in the WebStore Manager.
Alternatively you can follow these steps:
- Copy the generated API key to the 'Enable Google Maps Integration' option in the WebStore Manager like shown above
Link back to Shipping Integration Based on Distance