I'm playing Skyrim Remastered on Xbox One.
Bloodline is the Dawnguard quest where you free Serana from Dimhollow Crypt and take her to a boat at Icewater Jetty, then on to Castle Volkihar.
My problem is I can't get into the castle. Apparently, Serana is supposed to tell me to "let her do the talking," but she doesn't ever say anything when I arrive at the castle. The solutions I've found so far have been for PC (edit config files) and older console versions (delete the DLC). Unfortunately neither of these will work with these versions ... right? Am I stuck with a permanent second companion?
Edit: I did try loading older saves, but the only choices I had were saves either from after I met Serana or WAY before I met her. I wasn't willing to lose that much progress.