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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Did you visit the castle before finding Serana? That's a known bug if she won't open the gate because she improperly initiated the gate opening dialogue when you first free her from Dimhollow Crypt. I believe you can wall clip through the gate from the right railing to reach the door itself and enter but I've never done it.