The Google Maps APIs require an API key for new domains as of today. See announcement:

  1. Create an API key as per instructions here:
  2. Drag the map widget onto your landing page
  3. Click the advanced edit on the map (the pencil)
  4. Click the <> source edit button
  5. Edit the line in the code that loads the Google Maps API to include your key as the value of a ‘key’ parameter. src="<YOUR KEY>".