Eddie_B

The elevator to the right when entering the Head Office on the Undisputed Claim leads to the negotiation room to progress the quest.

'Forbidden secrets of the undisputed claim' can softlock if you pickpocket the recipe after convincing(or bribing) Vallow Andrews for the quest item. Upon returning to Middle Manage Twombly there's no option to complete the first half of the quest and the only dialog option is to infer who the last target is.