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Welcome to Justanswer.com, my name is Dustin.I'm sorry to hear about the issue you are having, I will do my best to help you resolve it.
Have you tried resetting your apple id password ***** your dell computer.
And then logging into your apple id.. and then on the ipad try and enter the new password.
Also, was your dell the normal computer that you connect the ipad too?
Thank you for your reply,Dustin S.Senior Technician and Former 31F1P ( Network Switching Systems Operator / Maintainer)