Bloody Harvest Heckraiser Challenge - Misleading description

I can’t get the Heckraiser challenge to be completed…

Heckraiser : Loot a Bloody Harvest Legendary
I’ve got the Fearmonger (new legendary shotgun) and the shield that releases screams upon breaking (nova-like) but it still won’t be completed …

Is there something I don’t understand ?

EDIT : it finally completed when I equipped the Fearmonger.
The description should be changed from “Loot” to “Equip”.

I got it completed by “looting”.
I didn’t had to “equip” it.

Any confirmation if the other legendary BH gun (The Stalker) counts or is it just the Fearmonger?

i got it off a roland’s call that had a terror annoitment.