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You have to insert your keys in 2 places
https://www.awesomescreenshot.com/image/3128612/740da156cb6a5c1c2215bccf956d1b3f
https://www.awesomescreenshot.com/image/3128613/730077aac3d3afc45f7d0caa1d7ff063
Read how to create key
https://www.wpgmaps.com/documentation/creating-a-google-maps-api-key/