Yes, Domination is now tracking, thanks.
I've had friends host a lobby, it doesn't find anyone. We are not the only ones finding problems with quick join. Cross-play is open, just doesn't find a game.
EDIT: Are you also looking at headhunted? Over on TrueAchievements, we have reports it is not working.
https://www.trueachievements.com/forum/viewthread.aspx?tid=1423940 - this is a thread from the achievement community.