Originally Posted by
Dave Noble
Given that she is not your child, the agent not being prepared to discuss the booking with you without confirmation that you should have access to it, seems perfectly reasonabe
No it isn’t. The OP was the booker, and the booker controls the booking. [ETA: It seems OP booked through AA which may be what caused the confusion here if BA didn’t recognise OP as the booker.]
In any case it would not be for the child to confirm to BA over the phone any authority to act on their behalf. If that’s in the CC manual (which I doubt) then it should change.