Not finding any nightmare sigils

I got to world tier 3, have done several Tree of Whispers turn-ins and opened the boxes, but I haven’t seen any sigils. I’ve seen several glyphs in the tree boxes, but no sigils. I checked my consumables just to make sure, but it’s only elixirs.

I’ve seen several guides say that a nightmare sigil is supposed to be a guaranteed drop from the first tree box you open, but that doesn’t seem to be the case. I’ve also seen several people respond to the issue of not finding any sigils with “just craft a sigil,” but at the occultist, the sigil crafting tab is greyed out. Do you first need to find a sigil before you can craft sigils?

I have 10 or 15 glyphs, but no way to rank them up because I can’t figure out how to get nightmare dungeons going.

Is there something I’m not understanding about how to find sigils? Or is it just a low percent chance rather than a guaranteed drop to get a sigil from the tree? Or is it supposed to be guaranteed from the tree and something is bugged?

I had to do like 10 before I got my first sigil. Eventually one will drop.

They also drop from World Bosses and Helltides. Although Helltides are supposed to be a rare drop.

I’ve run a huge number of dungeons, helltides and whispering tree drops… enough that I’ve made it all the way to Torment, yet I still haven’t found a single sigil. I didn’t have this issue at all on my normal necro, but on my hardcore sorc for some reason it seems they’ve disappeared entirely from the game. Really putting a damper on my progress and I haven’t seen a single viable solution. I just logged into my necro and wandered around doing nothing in particular and found a sigil so I know it should be basically impossible that it’s just luck at this point.