4 troops with same mana type task

How to complete this? I’ve done it with 4 of the same troops, and 4 different troops all with only 1 and the same mana color. Neither finished the ask. It’s in the most annoying task slot that is blocking other valuable tasks. Another thread or two like this so I’ll delete after I get a solid, informative answer.

It’s been mentioned that you need 4 different troops with the same mana.

That said, 4 troops with a common mana has worked for me. I was using Moloch, Lady Sapphira, Paladin, and Celestria (all are yellow/something) and the challenge popped.

I forget how to delete posts