I had a similar issue with the opening of the selune box. Only by accident found out that the wearer of the selune prayer could do it. In hindsight, yea I should have known.
On the other hand, as it's a beta, we can are on the lookout for bugs that interfere with the game. In the official release, one would probably resort less quickly to a bug-scenario .
Meanwhile, if there's something blocking like this, I do let all party members have a try,.