Hi, I see that map is correct now. Maybe Google needed a time to activate your key.

BTW

Remember that we just used Google Embed code, and it's on your side to deliver correct keys etc. In 99% cases problems with map is not caused by us.

Thanks for your fast answer, but it's really strange: I checked it on 2 different pc's in FF, IE and Chrome and on my cell phone, for me on all those tests just now I still see the "for development purposes only" code. Any idea what I could do?

for development purposes only

Is 100% Google response, not from us. API must be assigned for domain and subdomain.

https://www.joomshaper.com/documentation/sp-page-builder/sp-page-builder-3/google-maps-key-for-developers

If you have problems with Google Maps, maybe use Open Street Maps instead. Free, no API. For typical user map is map.

You can always use RAW HTML addon and embed code from google maps generator - always works, no API.