Challenge Not unlocking

Hey having trouble here. Completed the normal H3 campaign playlist but the challenge for doing an H3 campaign playlist didn’t unlock for me. It did for my friend who I was doing coop with. Do I have to be playing as master chief or something?

This is specifficaly about the Voi Polloi challenge, in the other thread linked below it seems to occur to playlist hosts in co-op and solo players:

https://www.halowaypoint.com/en-us/forums/f3681fbc78fa43878c4aec9a63a46224/topics/challenges-are-bugged/7365b54a-abd9-4b43-bab0-3f0ec0114bc9/posts?page=1#post13

> 2533274892244514;2:
> This is specifficaly about the Voi Polloi challenge, in the other thread linked below it seems to occur to playlist hosts in co-op and solo players:
>
> https://www.halowaypoint.com/en-us/forums/f3681fbc78fa43878c4aec9a63a46224/topics/challenges-are-bugged/7365b54a-abd9-4b43-bab0-3f0ec0114bc9/posts?page=1#post13

I just completed the wheels playlist and it counted. So maybe this is something I gotta do solo. Weird.