Google Maps API-key not working on shared project

Building an Android app with a group of people, and implementing Google Maps in an essential part of the application.

I've set up the map correctly and tested that it runs as expected on my machine, however after pushing to GitHub and having some project-mates test the app for themselves, the map does not load on their end due an unrecognized API-key.

I set up and obtained the key by following the link prived in the "google_maps_api.xml" file that is generated when creating a new maps activity. The key is visible and valid on my Google Cloud Platform, and as I mentioned it runs perfectly on my computer.

Is there some setting/step I have missed? Please let me know if I can provide any additional information to clarify!