How to handle error message “Geocoding Service: This API project is not authorized to use this API”

Please follow the below steps : 

-Step 1: Go to Developer Console

-Step 2: Search ‘Maps’

-Step 3:  Search for Geocoding API, Geolocation API, Maps JavaScript API, and Places API (see screenshot below) 

-Step 4: Click to each and Enable it.​​

*Note: In case, all APIs are enabled but the issue still remains, please try to disable and re-enable all of them.