Okay so I downlowded the bullsey pack and I cant get it to work. When I try to do custom games it sais player failed to load content. Also it will not allow to play xbox live on the DLC maps. Please let me know if anyone else is having these issues. I was on the phone with customer support for 4 freaking hours. They said there could be maintenance on backup survers or the servers are being overloaded. Let me know what going on for you guys and if you know how to fix it???
your not the only one. their have been many people with this problem. i have been talking to xbox support on twitter (ridiculous i know) and they have been very helpful, but still can’t fix it. one of them did tell me they have been seeing this problem a lot. apparently the method that works the most (can’t confirm since i haven’t had a chance to test it yet) is to delete all the DLC maps and then redownload them starting with the champions bundle. they said it might not work. i really hope 343 does something about this. they won’t even acknowledge it. hell, half the people here won’t even lift a finger. it really is aggravating. they only care that they can’t see their new gear in spartan ops (granted i would like to as well, but at least they can play the maps while we can’t). really pissed at this point.
If you guys want you could add your issues to this thread
https://forums.halowaypoint.com/yaf_postst223935_Champions-Bundle-Known-Issues.aspx
And yeah theres a lot of us who are having similar problems. You my friend are not alone 
we all got your back.