In most cases, this happens if the connection setup is limited. All DLC downloads are directly from the 1st party's servers. (Xbox or PSN) I can see that you tagged Xbox One, so I presume this is for this console, right? If so, try the following steps:
- Go to games and apps from your Xbox dashboard
- Proceed to games
- Highlight Ghosts then press the menu button from your controller
- Choose Manage game and check for the conents.
- Uninstall and reinstall the contents.