Can't craft/break sigils after quest

Was it a Tier 3 NMD?

How to Unlock Sigil Crafting

Unlocking Sigil Crafting

In order to unlock Sigil Crafting at the Occultist, you must first complete a Tier 3 Nightmare Dungeon. Follow these steps:

  1. First complete a Tier 1 Nightmare Dungeon, which you acquire through the Tree of Whispers in Nightmare Difficulty.
  2. As you kill monsters and progress through the Tier 1 Nightmare Dungeon, you are likely to find a Tier 2 Nightmare Sigil. If you do not, run any Tier 1 Nightmare Sigils you acquired in that dungeon to try again. You can also reliably acquire additional Tier 1 Sigils through the Tree of Whispers.
  3. Run a Tier 2 Nightmare Dungeon or Dungeons to acquire a Tier 3 Nightmare Sigil.
  4. Once you acquire a Tier 3 Nightmare Sigil, complete that Dungeon to unlock Sigil Crafting!

Player Testimonial: