About an hour ago, swat was working decently for me. Havent played since though.
Check out the Halo $10 Swat Tournament here: https://www.halowaypoint.com/en-us/forums/84ad72a8b51847978545f685f651fc15/topics/10-4v4-swat-tournament---14-12-2014/9750f38e-b42e-40d8-9788-25b944a439a5/posts
It’s free to enter, 4v4 Swat on Lockdown. 14th December 7pm GMT start time. All the info is on the thread, and you can sign up by replying to it with your team name and players. If you enter, good luck!