Sounds like you have the bug a bunch of us have run into. Check this thread.
https://forums.ea.com/discussions/dragon-age-the-veilguard-tech-issues-en/cant-interact-with-certain-objects/5006443?after=MjQuOXwyLjF8b3wxMHwxNDowLDM5OjF8MTA
Thanks. This is my second playthrough. I think my save is borked at this point. I killed the thing Morrigan points you to in the crossroads, assuming now I did it before the world state was ready for it. I did not kill the boss behind the sealed gate though. Now I am at the point of no return, with boss behind the sealed gate still there, but the fight Morrigan points to you complete, and ALL unique chests and altars are locked. NOTE: when I killed the one Morrigan points you to I couldn't open that chest, assuming I could advance the world state and come back to it. Big ole NOPE on that one.
How did you finish the game once already? XD I am at more than 130 hours in my first playthrough LOL.
