Halo MCC Season Challenges Bugged

Tried completing the "because you begged " challenge which requires one to jump from a fatal high place and assassinate an elite in halo reach. There is an achievement for doing this in MCC which I just got but unfortunately the challenge didn’t compete which both the achievementand challengego hand and hand, I did this challenge on both my friends accounts and the achievement popped and the challenge completed. So it’s glitches and all I ask is to fix it and give this to me already since I spent 3 days trying to fix the issue and redoing the assassination over and over. Im not the first to complain about this bug

Hey OP, to keep things tidy and save a million threads on this:

if you are on PC please see this thread:
https://www.halowaypoint.com/en-us/forums/f3681fbc78fa43878c4aec9a63a46224/topics/because-you-begged-seasonal-challenge-impossible/5f6dbd6c-1201-4b86-aa44-a27e654a78d7/posts?page=6#post111

For Xbox you can use this thread:
https://www.halowaypoint.com/en-us/forums/84ad72a8b51847978545f685f651fc15/topics/because-you-begged/a3b79f15-868b-401b-b216-58cf21abe3dd/posts?page=12#post223

Also worth reading over the latest info from 343 about the challenge:
https://www.halowaypoint.com/en-us/forums/243780d3b80b4bb6ac7917a8942286db/topics/mcc-development-flighting-updates/3e3252e1-297a-4590-a7ab-67c133b3d37d/posts?page=4#post65