Voice of Authority from Order Domain cleric states that
If you cast a spell with a spell slot of 1st level or higher and target an ally with the spell, that ally can use their reaction immediately after the spell to make one weapon attack against a creature of your choice that you can see.
Since being in a range of fireball makes you a target, can you activate Voice of Authority by casting fireball on your ally?
Note: I use fireball just as an example and comedic effect. I'm pretty sure it's not the intended use of Voice of Authority, but I'm curious of the RAW reading of using harmful spell to activate the feature.