Visualize UI Validation Errors on Controls using MVVM CommunityToolkit

I am trying to implement UI Validation using ObservableValidator from the CommunityToolkit to highlight controls and show error messages when they appear. From the docs I could only find on how to implement the required attributes for the ViewModel, not the Xaml part itself, so I suppose it should work out of the box. I have broken down the problem to a simple reproducable project, here is some code (this is of course only to reduce as much overhead as possible, and only an example to showcase my problem):

View code (MainWindow.xaml):

<Grid x:Name="root">
    <TextBox Text="{Binding Name, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Height="70" Width="150"/>
</Grid>

Code behind (MainWindow.xaml.cs):

public sealed partial class MainWindow : Window
{
    public MainWindow()
    {
        this.InitializeComponent();
        root.DataContext = new ViewModel();
    }
}

public partial class ViewModel : ObservableValidator
{
    [ObservableProperty]
    [NotifyDataErrorInfo]
    [Required(ErrorMessage = "Username cannot be empty.")]
    [MinLength(2, ErrorMessage = "Provide more than 1 Character.")]
    private string _name;
}

This is pretty much as simple as it gets. What am I missing, is the behavior I want really not supported or am I misunderstanding something? Help is much appreciated.

You need to subscribe to ErrorsChanged:

public ViewModel()
{
    this.ErrorsChanged += ViewModel_ErrorsChanged;
}

private void ViewModel_ErrorsChanged(object? sender, DataErrorsChangedEventArgs e)
{
    if (this.HasError is true)
    {
    }
}

You should check out the MVVM Toolkit Sample App. It has some sample code with a custom control ValidationTextBox which handles error messages by itself.