Hello,
I see you want to disable two-factor authentication. For some background I suggest you read the document: "Two-factor authentication for Apple ID" - Two-factor authentication for Apple ID - Apple Support
The statement in the support article, "If you're already using two-factor authentication with your Apple ID, you can't turn it off", can be misinterpreted as saying nobody at all can ever disable two-factor authentication, but subsequent sentences show this is not quite the case.
In practice, if two-factor authentication was activated automatically when you created your ID (basically any new account created in the last couple of years), you indeed cannot turn it off.
Some people have an older account originating before two-factor authentication was mandatory on new accounts. If you have one of those and recently activated two-factor authentication, "you can turn it off within two weeks of enrollment. If you do, your account is less secure and you can't use features that require a higher level of security."
If you did indeed recently activate two factor authentication and want to disable it, you should check for an email from Apple. If you don't see one about this, look in your junk mail folder.