phone keeps asking for other phone passcode
I bought a new iPhone 6S Plus and once I had updated IOS I was able to back up from my older iPhone 5 via the iCloud. I now get a 'follow-up' in settings. Which says -
'Finish changing your passcode.'
I click on this and my phone asks for my Apple ID passcode. I enter this and then the phone asks me for my passcode. I enter this and then my phone gives me this message -
'Enter Passcode for Other iPhone'
'Access to your account is protected by the passcode for "Mark's iPhone5". Your passcode is encrypted and cannot be read by Apple.'
I enter my passcode for my iPhone5 and get a message saying "Incorrect Passcode. Enter the passcode for your other phone". (The passcode I have entered is definitely correct and id the same passcode I use for my iPad.) I enter my passcode again and get the same message. If I enter it a 3rd time I get a warning and have to start from the beginning again.
There is an option to enter a passcode from a different device, so I choose my iPad and enter the code. When I go back to settings the follow up flag is still there and I am right back to the very start. I have done a reboot, but the follow up flag is still there.