I also think if you've got Friendly status with the Zhentharium's you should also be able to access the underdark elevator.
I hope not. :-/
I dont even know if we can be called "friendly" they are at best "curently not hostile".
I know this is still early access but a lot of the "good" options I feel can sometimes be lacking.
Not just good options ...
We are also missing option to kill (or kockout w/e) Tiefling childern, so they cant go "tell on us". :-/
We are also missing option to persuate Druids to help with defending the Grove (wich is especialy stupid, when PC is Druid and allready has ben named Faithwarden ... i mean Kagha litteraly said "when you speak the circles will listen" ... and then once Grove is under siege, she attack you on sight. :-/ )
We are also missing option to give proof of Kaghas betrayal directly to Halsin after we help him ...
You know something like "I have saved the adventurer, so Goblins have no way to find Grove location ... and Kagha is preparing THIS ... lets hury to save the Grove, we can allways return here later."
(Would be great if we then get attacked by the gate with FULL strength of goblin army ... meaning mainly all 3 leaders at once.)
By the way i allready started whole topic with options im missin in this game:
So far im not aware of even single one of them being adressed. https://forums.larian.com/ubbthreads.php?ubb=showflat&Number=741085#Post741085