We are using the latest version of AppStudio for ArcGIS Desktop and Portal for ArcGIS 10.6
We create a webmap in Portal for ArcGIS, we add the sampleserver6 wildfire feature service, change webmap's sharing property to public.
When we configure the Quick Report template with webmap ID hosted on the Portal the map does not load.

We created a similar webmap in ArcGIS Online account and map loads succesfully in the Quick Report Template.
Any suggestions would helpful.