问题 I'm getting the the Developer (Code:10, message:10:) error when trying to sign in using Google Sign-in while using FirebaseUI's Authentication. All works well on development, but when I sign my bundle using my upload key and then run it on a device, it fails. I looked at associated questions here, here and here and the answers didn't help. As you'll see below, I've tried their recommendations. What I've tried: Add SHA1 fingerprints to the Project Settings at the Firebase Console for debug,