Flutter Provider - Checkbox not getting checked

Below is my ViewModel class :

class SignInViewModel extends ChangeNotifier {
  var isRememberMeChecked = false;
  final TextEditingController emailC = TextEditingController();
  final TextEditingController passwordC = TextEditingController();

  Future<bool> signIn({
    required String email,
    required String password,
  }) async {
    /// Implement Api Call Here
    return true;
  }
}

You can see the class is extending ChangeNotifier & Please not the variable named isRememberMeChecked which is by default 'false'.

Now, In my Widget class, which is StateFulWidget, I am trying to change the value of CheckBox as below:

child: Checkbox(
          fillColor: theme.checkboxTheme.fillColor,
          value: widget.viewModel.isRememberMeChecked,
          onChanged: (bool? value) {
            widget.viewModel.isRememberMeChecked=value!;
          },
         ), 

You can notice this line:

widget.viewModel.isRememberMeChecked=value!;

EDIT:

I have also tried it with set as below:

widget.viewModel.setRememberMe = value

In ViewModel class :

set setRememberMe(bool value) {
    isRememberMeChecked = value;
    notifyListeners();
  }

But with this also Checkbox UI not getting checked to unchecked. Means the Checkbox UI is not reflecting for true or false values.

What might be the issue?