Apple's use of an Apple ID on iPads is something Apple does towards keeping your device secure. But it can also be problematic, especially if you have multiple Apple IDs and can't remember the user names or passwords for them all.
Macworld reader Mae ran into an Apple ID problem when using her iPad. An Activation Lock suddenly appeared on screen.
Now I am not sure on what Apple ID I used to set up the iPad. I also forgot its password, because I’m using a different Apple ID. The message that appears is “This iPad is linked to an Apple ID. Enter the Apple ID and password that were used to set up this iPad,” followed by the email address.
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