All affected accounts have been reinstated and the issue has been resolved
Sadly, the release of the add-on wasn't without issues, as those who should have gotten it for free weren't able to download it until a day later than expected.
Over the weekend, other Halo 4 players found that they were banned from accessing certain parts of the game.
Now, Microsoft has confirmed, via Kotaku, that the banning error has been remedied and that only a few people actually had their accounts affected by the glitch.
Those players were reinstated by Microsoft and the company says the error shouldn't affect anyone else in the future.