Had similar issues here. We had to re-enroll quite a few after upgrading to iOS6. We had to run the enrollment process several times on a couple of them. We could not pinpoint the cause of this. We even tried the problematic ones in different spots in our network to rule out Casper’s suggestion that it might be a network problem… but the results are really irrelevant. At some point they had me check the database version so the ball might be in their yard.
