When you attempted to create/login to an account in game, did you get any sort of error or error message?
The backgrounds you are referring too were for BO2 and MW3. You are able to claim 3 different ones for just playing the game, obtaining a prestige level, and hitting max prestige. For more information please see: http://community.callofduty.com/community/call_of_duty/english/ghosts/blog/2013/ 10/24/call-of-duty-ghosts-intel-launch-countdown-double-xp-week#.UoOeqPl4xMB
I can now log in and create a clan. There was no error just didn't go anywhere. Same for registration in game, it didn't allow you to do anything. The 'Accept' and whatever the other one was called was there, but clicking it did nothing.
I own BO2/MW3 and these are not showing in my ghosts account.
Also in game I can not get more than 200 scavengers. I am trying for the gold patch but it will not go over 200 for some reason. It shows as 200/300 for silver and 200/750 for gold.