deal damage with the incendiary airburst launcher as support

So frankly after divulging to using Reddit to try and find a work around for dealing the damage on this challenge I am now here to basically file a formal complaint of how in the actual hell your supposed to do this challenge. Every method of doing this that I’ve seen or tried does not work (for me at least). Am I supposed to do damage to vehicles? Enemy equipment? Enemies? Who tf knows because at this point after 4 hours of trying I have accumulated a grand total of 74 out of the 2,000 damage I need.  What on gods earth am I supposed to be doing damage to exactly because all it says is deal damage. Which I would assume means deal damage to players, which I have done and gotten multiple kills with it at this point as well as gained far more accumulated damage than 2,000. So How tf am I gonna get this done?