Spell: Dispatch with daggers

Classes Rogue
1

I was using this spell just fine with a pair of maces. Why won’t it work with a pair of daggers?

2

Outlaw rogues don’t use daggers

3

When did this change?

4

Legion I think?

You can use dagger in your offhand. But MH has to be a sword/mace/axe/fist weapon.