On the quest [i]Bloodline[/i], when I went to Castle Valkihar Serana wouldn't open thy gate to let me in. I dont have mods installed, this is Special Edition on Xbox One.
Edit: I finally got it fixed, thanks to everyone!
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Go back before you started the dlc. Wprse case scenario is you have visited the castle before and depending on how far back ago that was you may have to forgo the dlc. The same thing happened to me but i started a new character as i literally beelined straight to the dlc at the start of the game.