We're excited to announce that we've fully migrated the Xbox Forums to their new home, here on the Microsoft Community forums!
As of today, going to forums.xbox.com will redirect you here to the Xbox area of the Community forums. We've moved all of your existing threads over so you can continue and start conversations with the new forums experience.
We sincerely appreciate the feedback you have provided over this transition and can't wait for you to check out the new Xbox Forums!
There are a few things that could be causing this,
1. You could of hit the 'back' button whilst in the matchmaking lobby, this disables the DLC. You can re-enable it by doing the same thing.
2. You could be playing in a party with friends who don't have the map packs
If your talking of collection 2, I'd suggest playing in the 'collection 2' playlist. It's a playlist that only features maps from collection 2. If you a CoD Elite premium member, you could always play in the elite playlists.