Just answering over here in case anyone finds this before our other thread - usually we don't provide official support for the Advisors endpoint as it is private, but since this is a bug on our end I figured I'd unofficially give people a heads up - Nightfall data is not appearing there due to what essentially amounts to a bug. It will automatically resolve itself starting on the 15th, however the Nightfall/Weekly Heroic will be pointing at a single Playlist and Skull information will be meaningless on said playlist. This is an unfortunate limitation of the new "Playlist" approach to Nightfall.