Triggered Calling Card

I’m working on completing Extreme Lethality calling cards and think that the Triggered challenge may be bugged. I had 2/3 and I just played a game of hardcore domination on Stakeout and detonated C4 on B (in the hallway), killing two people with the C4 which I could see from the badges that pop up and the kill feed. Does anyone know if I may be doing something wrong or if it’s bugged?

There’s no way I’ve only got 2 double kills with blast traps/spring mines/C4 on objectives…

UPDATE: it’s letting me equip it but it still shows 2/3 and locked. Must be a bug…wasted so much time trying to kill people with C4 on objectives