Hi guys
Found an issue that regards certain maps, after getting the Mordor fortress upgrade for morgul sorcery and having a level 3 troll cages Olog-hai cannot be built on certain maps.
For instance trolls cannot be built on the map Minas Morgul even with all upgrades unlocked
However on maps that have standard fortress's once upgrades have been purchased you can buy them.
hope this makes sense and thank you