Not sure if this is something others are experiencing, but I get an error whenever I generate a Feature Report while "Save to my ArcGIS account" is selected.
I remember that this happened some time ago, but forget when. I don't believe any Portal settings changed to cause this.
Honestly, since everything else works fine, I actually enjoy this... I hate that the "Save to my ArcGIS account" is both checked by default and hidden after that UI update. So, reports not saving while I do my testing is actually really nice.