Any 02+ can open the door of the main armory.
Any OfC+ can open the door of the auxiliary armory.
If you aren't 02+, you simply cannot open the door.
I just tested this myself, and it works perfectly fine.
Edit:
Khub said he applied an update today. So it MIGHT have been broken before. Anyhow, it works now. So try again and see if it works for you as well. If not, PM him or post here or something.