Conflagrate of enchant weapon tree does not activate on stationary targets. This includes but is not limited to Test Dummy, Lagon, and Spires in Monoliths.
Additionally, it does show damage numbers or make sound effects, though this is of less concern.
Conflagrate shouldn’t activate on the dummy since it’s worded as “enemies” & the dummy isn’t an enemy. It should activate on Spires. If it’s not working on Lagon it’s likely another “Lagon’s base is too far away therefore the game conciders him out of range” issue.