I have tried all of the above and nothing works. I still have this showing on my iPhone and both my iPads. It is driving me crazy as I hate the red numbers on my Home Screen. I have changed my Apple password. Everything is completely up to date. I already use Touch ID and I also know, and occasionally need to put in my six figure code. I understand that this is a recurring error with Apple. Someone must know how to resolve it.
I have now been unable to POST my reply because my session has expired despite me signing into this approximately two minutes earlier! I am a very fast fully trained touch typist so this took barely a minute to type!