This is 2 bugs in one. I have reached Durance of Hate in the expansion where nothiung happens when I press the entrance (bug1). I then started doing random helltides, and when i try to return to Kurast Docks it says “You canot access this location without owning Vessel of Hatred”.
Note that I preordered the ultimate edition, and have already played around with the new areas (a prerequisite to even reach Kurast Docks".
In other words there seems to be some strange issue with validating my ownership of the expansion.
When I press Shop and go to the expansion it clearly states that I own it.