Back in July, it was reported that scalpers in China snagged up Apple Genius Bar appointments in the masses and then re-sold them on the black market. Apple has found a way to prevent this from hindering the scalpers from doing this again.
Apple is now requiring everyone to use their Apple ID to make a Genius Bar appointment.
In the past, there was no log-in required. All you had to do was go to the Apple Genius Bar reservation system, enter the store, enter the date, and pick the times.