Password required for invalid Apple-ID
When we set up my wife's new iPhone 7 and it asked for her Apple-ID for iCloud setup, I put n her email address that's not her ID. Of course this failed since it's not a valid Apple-ID. Then I put in the proper email and password and got the setup to complete. Now every time you turn the phone on it says she needs to sign in to iTunes with the invalid ID. You have to cancel it to continue with anything else. Both the the app store and iTunes work fine, as does iCloud backup and restore. How can I get this annoying popup to go away? Hopefully without having to wipe the phone clean and start the setup all over again.
iPhone 7, iOS 10.0.3, 128 GB