A little tip for those of you using GCP Firestore (or wanting to) and you are setting up your cloud alias. When Using GCP Firestore in native mode the communication is done via apis. In setting up the service configuration in CF you have to enter a database id. This is not obvious (at least to me) but no matter what your project is you have to use "(default)" , with the parentheses, as your database id and leave the emulator host blank. 🙂