I have do same as you but in it I fill everything in my text form filed and when I have submitted it so it not post the value to firebase and not save it that is my post method

void signUp(String email, String password) async { if (_formKey.currentState!.validate()) { try { await _auth .createUserWithEmailAndPassword(email: email, password: password) .then((value) => {postDetailsToFirestore()}) .catchError((e) { Fluttertoast.showToast(msg: e!.message); }); } on FirebaseAuthException catch (error) { switch (error.code) { case "invalid-email": errorMessage = "Your email address appears to be malformed."; break; case "wrong-password": errorMessage = "Your password is wrong."; break; case "user-not-found": errorMessage = "User with this email doesn't exist."; break; case "user-disabled": errorMessage = "User with this email has been disabled."; break; case "too-many-requests": errorMessage = "Too many requests"; break; case "operation-not-allowed": errorMessage = "Signing in with Email and Password is not enabled."; break; default: errorMessage = "An undefined Error happened."; } Fluttertoast.showToast(msg: errorMessage!); print(error.code); } } }

postDetailsToFirestore() async { FirebaseFirestore firebaseFirestore = FirebaseFirestore.instance; User? user = _auth.currentUser; UserModel userModel = UserModel(); userModel.email = user!.email; userModel.uid = user.uid; userModel.name = nameEditingController.text; // userModel.no = mobileEditingController.text; await firebaseFirestore .collection("users") .doc(user.uid) .set(userModel.toMap()); Fluttertoast.showToast(msg: "Account created suscessfully"); Navigator.pushAndRemoveUntil((context), MaterialPageRoute(builder: (context) => nav()), (route) => false); } }