Prior to proceeding with any Legion questline, you will need to join the Imperial Legion in a set location - currently either Fort Darius in Gnisis or the Dustmoth Legion Garrison in Firewatch.
The following Quest_ID and Index codes can be used with the Journal Console command to manually update the quest to a certain point.
Shipment to Nivalis (TR_m1_IL_Nivalis)
Index
Finishes Quest
Journal Entry
5
Vycius Pitio asked me to deliver a shipment to Nivalis. I am to go to Icebreaker Keep and speak with Tiberia Rone.
10
I have delivered the missive to Tiberia Rone. She also gave me 50 drakes.
15
Finishes quest
Vycius thanked me for delivering the missive.
Shipment to Nivalis (TR_m1_IL_Nivalis2)
5
Darnell was pleased that I showed him the shipment to Nivalis, and gave me a book about the history of Firewatch. He then told me to talk to him in the watchtower at the east end of the town if I get any suspicious orders.
6
Darnell asked me to show him the shipment to Nivalis. I refused. He then told me to talk to him in the watchtower at the east end of the town if I get any suspicious orders.
10
Darnell was pleased that I showed him the shipment to Nivalis, and gave me a book about the history of Firewatch.