Thanks so much for all the email regarding the adding an additional ID issue Apple customers have been reporting this weekend. This tip came from a reader — it was short, sweet and it worked (for me). Thank you RF!
The reader wrote:
Make sure the date on the device is correct.
iPods and non-3G iPads can lose the setting.
Or try from a “full” browser on laptop/pc in the apple store.
Make sure to sign out of the apple store in settings.
Reboot / restart the device.