Maps Embedd API will not display. Google Maps JavaScript API error: ApiNotActivatedMapError But the API is activated

I have generated and activated a Google Embed Maps API for this site: https://delavan-realty.com/listings/ The map won't display and the console shows this error: Google Maps JavaScript API error: ApiNotActivatedMapError

All I have to do is drop the API into this person's theme for real estte sales and it should display.

I have been fighting with this for 2 hours and have no clue what I am doing incorrectly.

Any advice?