Hmm I would try clearing the cache, I really don’t know if it is possible on the Xnox One, but I imagine it is. If that doesn’t work try deleting the downloaded content and reinstall it.
Okay that makes it even easier, just go to the dashboard, go over to storage, and clear the cache. If it doesn’t work after doing so, you can also try deleting your profile and redownloading it.
Okay, well you aren’t the only one having this problem.
There is many players having this issue, all I could say is be patient until Sledgehammer Games updates you with information. Follow their Twitter if you have on they should put some updates out on the issue.
This same thing happened to me… Just go to the Dashboard go over to Active downloads, you will be downloading the content, wait for that to be downloaded… Try again.
you just enter in a non xboxlive profile then when your in exo zombies press home sign out then sign in on xbox live thats the only way to get around it so far i do it and u can join with other ppl and all it works!