The recently released Public Notification widget in WAB works well when using a parcel data set. However, it does not allow you to select a point layer as the "Layer to use to select addressee layers". This limitation reduces the number of residences that are notified, particularly those people living in mobile home courts, apartments, or other locations where there are multiple residences for a particular situs address.
Please add the functionality to select either a point layer or a polygon layer as the addressee layer in this widget.