Have seen this now several times, and I can’t recall a topic about it here:
The daily challenge ‘win in a 2vs2 quick match’ is bugged out and will never be awarded.
2vs2 is something I play on a daily base, can’t really think about a day where this one was payed out on a win in 2vs2 QM. So finally decided to use 3 minutes of my time to make a post about it. 
. I’ll make sure the team checks it out.