Old Apple ID Verification request
I have updated and changed my Apple ID primary email address a while ago.
For some reason my iPhone 6Plus keeps asking me (every 30 sec) to verify the password for my OLD Apple ID email address.
Since it does not exist anymore I have no idea how I can delete this account from the system (everything now is connected to my new Apple ID). HELP PLEASE!!!
iPhone 6 Plus, iOS 10.0.1