i have a binding on a text field as follows:

<Label Grid.Row="1" Grid.Column="1" FontFamily="FontCamptonMedium" FontSize="12" Text="{Binding CurrentBooking.FullName}" TextColor="Black" />

in the code-behind of this page, we use dependency injection to bind to the corresponding view model, like so:

public AppointmentPendingResponse(BookingViewModel viewModel): base(viewModel)
{
    InitializeComponent();
    BindingContext = viewModel;
}

this view model that we are binding to inherits from another baseviewmodel, like this…

public partial class BookingViewModel : BaseViewModel

…which in turn, is declared like this:

public abstract partial class BaseViewModel : ObservableObject, IQueryAttributable, INotifyPropertyChanged

in the baseviewmodel we implement the following to make use of inotifypropertychanged:

public event PropertyChangedEventHandler PropertyChanged;

protected bool SetProperty<T>(ref T backingStore, T value,
    [CallerMemberName] string propertyName = "",
    Action onChanged = null)
{
    if (EqualityComparer<T>.Default.Equals(backingStore, value))
        return false;

    backingStore = value;
    onChanged?.Invoke();
    OnPropertyChanged(propertyName);
    return true;
}

protected void OnPropertyChanged([CallerMemberName] string propertyName = "")
{
    var changed = PropertyChanged;
    if (changed == null)
        return;

    changed.Invoke(this, new PropertyChangedEventArgs(propertyName));
}

inside the bookingviewmodel, we then populate the CurrentBooking property like this:

CurrentBooking = (BookingModel)selected;

the resulting json looks like this:

{"FullName":"LAWMAN","IdentityNo":"123","Relation":"SELF"}

the fact that i am able to get json data means CurrentBooking should not be null. so why is my label text not being populated? im not sure what im missing here.