Testing with secure Portal webmaps and the map is still not loading:
Thank you for posting your question in our GeoNet community.
Quick Report support for secured feature service but not secured web map. Currently, only public web map is supported (see screenshot below). You can contact the Esri Technical Support to create an enhancement for this.
Thank you Tina,
Got confused with release notes, it said secure maps.
I am testing with secure feature service and public web map, and data does not show up.
That is a bug fix for the Map Viewer template.
Retrieving data ...