I inserted the GoogleMaps map, it works too. A valid API is used for all functions as well as a billing account.
The map is displayed normally at first, followed by an error message that the page could not be loaded correctly. I can confirm this but still have the message in the card that turns slightly greyish “For Development purposes only”
What is wrong? My Config is:

{
			module: 'MMM-GoogleMapsTraffic',
			position: 'bottom_right',
			config: {
				apiKey: 'My Key' ,
				lat: 49.56324,
				lng: 11.34776,
				styleMapType: "dark",
				disableDefaultUI: true,
				backgroundColor: "rgba(0, 0, 0, 0)",
				updateInterval: 15000,
				height: '450px',
				width: '450px'
				}
		},

Thanks for help.

Best regards

Fufu1408