So I did Sigmascape 1-4 and Jade Stoa on normal and completed them. After i did them I got the quest to unlock the Savage mode, for sigmascape at the Magitek Terminal in the Reach and for Jade the minstrel in Kugane. Once I did these quests i got the pop up message saying Sigmascape / Jade Stoa Savage is now unlocked.

My problem is when I look at my Duty finder or even party finder it is not showing up on the list despite my doing the quest to unlock them. Am i missing a pre-req that I don't know about in order to be able to do these?