halo 4 map pass/store bought code

Ok, I redeemed the code on my gamertag and I see the microsoft points; that part is fine. But where ever I look I get a warning - “if you bought map pass from ‘X’ do not purchase here or you’ll be charged twice.” Where should I go to get my stuff?
Waypoint → store?
Xbox Marketplace in the game?

I’m sure you’ve figured this out by now but just to be sure.

Buy the map pass in game, also do the same with the map packs as well!

When you say in game do you mean from the waypoint/shop within the game or xbox marketplace in game?

If you have the Map Pass, DO NOT buy them from the Dashboard. When you play Halo 4, you’ll see the Marketplace menu at the bottom. From there it’ll list the map packs for free. Download them from there.