My data is not getting uploaded in firebase it has internet access creating user with firebase auth that also not getting uploaded & nor child created

Question

Below is the java file of this activity. I want my name and email to be stored in realtime database and sign in with firebase auth, but neither is working. I followed the step like internet access and firebase steps, but still the data isn't getting uploaded signup.java is the files name .

import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;

import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;

public class signup extends AppCompatActivity {
    EditText fullname,  email, password;
    Button btSign_in, btregister;
    FirebaseDatabase firebaseDatabase;
    DatabaseReference reference;
    FirebaseAuth auth ;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.activity_signup);

        fullname = findViewById(R.id.etfullname);
        email = findViewById(R.id.etemail);
        password = findViewById(R.id.etPassword);
        btSign_in = findViewById(R.id.btSignUp);
        btregister = findViewById(R.id.btregister);

        btSign_in.setOnClickListener(view -> {
            Intent intent = new Intent(getApplicationContext(), Login.class);
            startActivity(intent);
        });
 created the child but still it doesn't appear still it doesn't get uploaded
       FirebaseDatabase.getInstance().getReference().child("User");

        btregister.setOnClickListener(view -> {
            String fullname_ = fullname.getText().toString();
            String email_ = email.getText().toString();
            String password_ = password.getText().toString();

            if (!fullname_.isEmpty()) {
                fullname.setError(null);
                fullname.setEnabled(false);

                if (!email_.isEmpty()) {
                    email.setError(null);
                    email.setEnabled(false);

                    if (!password_.isEmpty()) {
                        password.setError(null);
                        password.setEnabled(false);

                        if (email_.matches("^[a-zA-Z0-9_!#$%&’*+/=?`{|}~^.-]+@[a-zA-Z0-9.-]+$")) {

                            firebaseDatabase = FirebaseDatabase.getInstance();
                            reference = firebaseDatabase.getReference("User");

                            String fullname_s = fullname.getText().toString();
                            String email_s = email.getText().toString();
                            String password_s = password.getText().toString();

                            storingdata storingdatass = new storingdata(fullname_s, email_s);
                            reference.child(email_s).setValue(storingdatass); 
                            auth = FirebaseAuth.getInstance();
                            auth.createUserWithEmailAndPassword(email_s, password_s)
                                    .addOnCompleteListener(task -> {
                                        if (task.isSuccessful()) {
                                            Toast.makeText(getApplicationContext(), "Register_Successfully", Toast.LENGTH_SHORT).show();
                                            Intent intent = new Intent(getApplicationContext(), Login.class);
                                            startActivity(intent);
                                            Log.d("LOG", "User regestered in authentication");
                                        }
                                        else {

                                            // Registration failed
                                            Toast.makeText(
                                                    getApplicationContext(),
                                                    "Registration failed!!"
                                                            + " Please try again later",
                                                    Toast.LENGTH_LONG)
                                                    .show();
                                        }
                                    });


                        } else {
                            email.setError("Invalid email");

                        }

                    } else {
                        password.setError("please enter your password");
                    }

                } else {
                    email.setError("please enter your email");
                }

            }
            else {
                fullname.setError("please enter the fullname");
            }
        });

    }
}

plz plz help me its imp and I have tried many ways but still it isn't working I have created the child but nothing gets uploaded