The problem is they're seemingly trying to comply with the rule introduced last season by the PL (R.16) that requires clubs to know the contact details of who they've sold tickets to and that the person buying the ticket is the one using it. It seems to be a very much OTT rule; can't think of any other sport that does this to this degree.
City, being City, really haven't thought it through properly and have probably created problems of their own making, on top of the problems created by this rule. I believe there are also software constraints they're trying to resolve.
It's a bit hypocritical of the club to be so keen to demonstrate full compliance with this rule when they demonstrate a completely cavalier attitude to the rule that requires them to be back in good time for the second half.