Data is not inserting into firebase

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Android

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Hello to all! I have been Using google firebase with my android apps for more than 2 years. Today while developing a new app I am facing a weird problem. I set up my firebase project on Google firebase Console successfully. I write the code to push data on firebase successfully.
But the problem is that No data inserted in firebase and no Error occurs in the console. I searched online a lot but all in vain. I am pasting Screen shot of my firebase console, database rules and my source code. Kindly guide me.'

database = FirebaseDatabase.getInstance();
      dealer_ref = database.getReference("reg_requests");
      
       btnSignup.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                       Dealer dealer = new Dealer();
    
                        dealer.setId(ed.getText().toString());
                        dealer.setMac(getMacAddress(LoginActivity.this));
                        dealer.setRegistered("no");
    
                        String id =    dealer_ref.push().getKey();
    
                         dealer_ref.push().setValue(dealer);
                    
                }
            });

What I have tried:

I have searched online by google. but all in vain