Hm, you actually report 2 different issue.
1. Request Map data
- I just tried on your site, it seems like Google return this following error :
[{"type":"reject","data":["This IP, site or mobile application is not authorized to use this API key. Request received from IP address 2401:c100:1100:504:2000::64, with empty referer"]}]
So I set this IP
2401:c100:1100:504:2000::64 into your project
https://take.ms/HkLvS , now it can able to get those map data, can you try again click detect location or search something and see whether you can able see those dropdown map data?
Do take note, that map preview image still not showing if you use your current template.
2. Render Map data
You can download my attached video, It show that map preview image if I switch to protostar template.