This is also affecting Hardened and Care Package Edition codes as well. The reason fans are so upset is because they can't access these maps ahead of the double XP session.
Apparently someone from Sony customer support told one gamer that their DLC code had already been redeemed in Germany, suggesting duplicate codes were printed.
"I rang Sony and they said that my code had been redeemed in Germany. Activision support tweeted me saying that my code should work. I don't know who to trust. I'm not bothered with double XP although it would be nice. I feel that £160 on Care Package Edition is now a waste of money and Activision are just milking it!” wrote user 'Bubonic Plague'.
PS3 is also having connectivity issues: "We are indeed up and running, but we are also aware not everyone can connect. We are investigating something with our partners at Sony," said Treyarch design director David Vonderhaar.
“We are currently testing backend matchmaking changes that we think can help with this. I don't have a time table, or I would tell you," he tweeted. Activision say they "are aware of connectivity issues" and are working on it.