У меня не регистрируется пользователь в Firebase

Менял complete listener на success, библиотеки кучу раз проверял, почту в Firebase открыл.

public class second_activity extends AppCompatActivity {

Button go;
    EditText loginsi, paswdsi;
    EditText pdag, mail;
    FirebaseDatabase db;
    FirebaseAuth auth;
    DatabaseReference users;
    TextView error;
    String login,pd,pdag1,mailstr;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);
        go = findViewById(R.id.button);
        loginsi = findViewById(R.id.editText4);
        paswdsi = findViewById(R.id.editText5);
        pdag = findViewById(R.id.passwdmore);
        error = findViewById(R.id.error);
        mail = findViewById(R.id.mail1);

        auth = FirebaseAuth.getInstance();
        db = FirebaseDatabase.getInstance();
        users = db.getReference("Users");


        go.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                login = loginsi.getText().toString();
                pd = paswdsi.getText().toString();
                pdag1 = pdag.getText().toString();
                mailstr = mail.getText().toString();
                if(login.length()<5){
                    error.setText("Password must be not less then 5 symbols");
                }
                if(pd.length()<5){
                    error.setText("password must be not less then 5 symbols");
                }
                if(!pd.equals(pdag1)){
                    error.setText("Passwords don't match");
                }
                //Работа с бд
                auth.createUserWithEmailAndPassword(mail.getText().toString(),paswdsi.getText().toString()).addOnCompleteListener(new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        if(task.isSuccessful()){
                            Intent intent6 = new Intent(second_activity.this, main_screen.class);
                            startActivity(intent6);
                        }else{
                            error.setText("Problem");
                        }
                    }
                });

                                }
                            });
                        }
                    }