I have a problem where my PointCollection won’t bind to the PolyLine. Here is my PolyLine

            <Polyline Stroke="Black" StrokeThickness="2"  VerticalAlignment="Bottom" Margin="0,0,0,60" Grid.ColumnSpan="5" Height="240" Width="290"  Points="{Binding PolyLinePoints}"/>

I want to make a simulation of a graph so that is why I tried Binding. The graph will have 5 points. The X axis is an increment of 75, but the Y axis is what I am trying to bind.
I will now give you a code snippet. I deleted more then half of the function UpdateGraph because it is not relevant to the question. I also added a print statement and I get the values for the X and Y as expected, they just do not want to show in the GUI.

    private PointCollection _polylinePoints = new PointCollection();
    public PointCollection PolyLinePoints
    {
        get
        {
            return _polylinePoints;
        }
        set
        {
                _polylinePoints = value;
                OnPropertyChanged(nameof(PolyLinePoints));
        }
    }


    private void UpdateGraph()
    {
        Application.Current.Dispatcher.Invoke(() =>
        {
            // Clear existing values

            _polylinePoints.Clear();

            for (int i = 0; i < latestValuesForSelectedEntity.Count; i++)
            {
           
                _polylinePoints.Add(new Point(i*75, CalculateYValue(latestValue)));
            }
            OnPropertyChanged(nameof(PolyLinePoints));
            foreach(Point p in _polylinePoints)
            {
                Debug.WriteLine(p);
            }
        });
    }