turn off two factor authentication

I made a mistake earlier - I hold my hands up (I'm not sure if it was on your thread or another) - You can no longer turn off two-step authorisation.

Please see this extract from Apple:

If you are already using two-factor authentication, you can no longer turn it off. Certain features in the latest versions of iOS and macOS require this extra level of security, which is designed to protect your information. If you have recently updated your account, you can unenrol within two weeks of enrolment. Just open your enrolment confirmation email and click the link to return to your previous security settings. Bear in mind that this makes your account less secure and means you can't use features that require higher security.