With great help from the GeoNet community ,I was able to get the Public Notification Widget from WAB developer edition into our organizations portal (version 10.5.1).
The problem I'm encountering now is that the even after setting up the Addressee layer and notification options to pdf and csv for the widget. the widget becomes non responsive and won't generate any labels.
seeking advice and guidance from folks that may have successfully accomplished this.
Thank you
Bhanu