After the ques "A New Source of Stalhirm"
https://www.ign.com/wikis/the-elder-scrolls-5-skyrim/A_New_S..., you have to have smithing at least to level 80 and the Ebony Peak unlocked. Otherwise you can't craft with Stalhirm.
For people, like me, who are light armor and only used smithing for house mats, this took sometime because I ended up needing to level from personal level 79 to 83 to get all the perks unlocked.