Apple Id Login Two Factor Authentication
Apple enabled two-factor authentication by default when you create a new Apple ID. And you will have no option to disable this feature. For old Apple IDs, you can enable it from your Mac or iPhone.
Once two-factor authentication is disabled, you can log in to Apple ID from anywhere, whether on the web, iOS, iPhone, iPad, Mac, anywhere, with only a password again, you won't need to double
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For example, if your normal Apple ID password is "applepassword" and the two-factor authentication code is "821 481", then the new proper password to login on the older iOS version would become: "applepassword821481" No spaces, no quotes, just the password appended by the two-factor auth code.
If you don't see the option to turn off two factor authentication on your Apple ID login page, that likely means you're not able to turn it off. In such cases, you'll have to contact Apple support to request that they disable two factor authentication, or register a new iCloud ID on the Apple ID website and change the iCloud ID on your device.
Since you have enabled Two-Factor Authentication, the login process will request for the verification code in addition to the Apple ID password, making it harder for anyone to gain access to your Apple Account. Now all this will sound familiar to those who are already used to the Two-Step verification process.