iPad's Apple ID did not reflect the change I made on and now I can't turn off Find my iPad

Solution 1:

I just went through this mess, almost the exact same steps (minus the boss asking). In my case I had forgotten about the iPad being logged in to the same account and did not turn off findMyiPhone on it before changing the appleId.

What worked for me finally, I found here apple's KB.

Log out of iMessage on the iPad, and the log back into iMessage making sure to use the NEW appleId email address. Next go to settings and turn off FindMyiPhone, you will be prompted for a password and the old appleid will still be displayed in the request, use the password for new appleid that you just used to log in iMessage, and it will turn off find my iphone.

Once find my iPhone is off, you can log out the account completely, and update the email address.