Option 1: Go to Firebase Console < Authentication < SIGN-IN METHOD, and see if you are using it in the Anonymous state. If you are, disable that and enable Email/Password or whichever login method you are using. Option 2: Check if the device you are testing with is running Google Play Services 9.0.0 or later. Add a log in onComplete() listener of createUserWithEmailAndPassword() to see what exactly is the reason behind the failure. if (!task.isSuccessful()) { Log.e(TAG, "onComplete: Failed=" + task.getException().getMessage()); } This can be due to the password or email you entered to create an account. Check: if the email you entered is in proper format and does exist. if password is strong enough to be accepted (usually not less than 6 letters). if there is already an account with the same email.
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