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09:01, 28 August 2018 If you use yourwon domain Google Maps can require an API key.
You can obtain an API key from Google and enter it here, usually a free key is sufficient.
https://developers.google.com/maps/documentation/javascript/get-api-key
See the developer console in your browser for more information about the map problem, Google will normally display information there about the problem and how to resolve it.