Hi.
I´m having a similar situation.
After I upgrade using early rings our SCCM server to 1910 version (site version:5.0.8913.1000) I actived the Bitlocker Management characteristics.
After that, I run the script to configure the portals. The installation run but show me a warning "Unable to determine web service uri to Audit Report. This can be corrected in web.config for the HelpDesk website."
When I went to Sccm Console reports I realize that Bitlockers reports was not showing in the console. Any other reports is present and works.
I test to get access to reports by browser and the situation repeats, everything looks fine and reports work except Bitlockers Reports that are not present
I tried reinstalling the report service roll in the console but bitlockers reports still not present.
Any idea on that situation?