Changed I'd and password. Now iPad will not accept locked out
Changed user name and password now cannot get in
iPad Air 2, iOS 9
Question marked as
Changed how?
Have you:
a) created a new AppleID account (inadvisable), or
b) have you updated the existing AppleID account with a new primary email address (with which you sign-in to your AppleID/iCloud account) and/or the associated Password?
If (a), the Activation Lock will require the original AppleID credentials.
If (b), you need to read this >>> What to do after you change your Apple ID or password - Apple Support