If you bought the Deluxe Edition of Call of Duty: Black Ops III for the Xbox One and are not able to download some of your pre-order DLC content, you are not alone. Microsoft is aware that some owners of Activision's first-person shooter are having issues with accessing those packs.
The Xbox Live status page currently says:
"We understand some of you who purchased the Call of Duty: Black Ops III - Deluxe Edition are being prompted to repurchase a Season Pass for the game and can't access the NUK3TOWN and The Giant bonus maps. We want to assure you we're working to fix this as quickly as possible. Thanks for your patience! We'll update you as soon as we know more."
We will update this post when this issue has been fixed.