If you have any problem with Google Maps, please open console to see error message. You can do it e.g. by clicking F12 in Chrome:
In this case the added key is not valid. Please create new one this way:
How to display Google Maps on my website? Creating a Google Maps API Key
The most popular problem with map is that added key do not have all Googlem Maps API key activated. Please make sure you added all
- Maps JavaScript API
- Geocoding API
- Places API