Remove two factor authentication
How to remove two factor authentication in my account
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For information on turning off two-factor Authentication, see the following from Two-factor authentication for Apple ID - Apple Support
If you're already using two-factor authentication with your Apple ID, you can't turn it off. If you updated to two-factor authentication inadvertently, 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.