How do I turn OFF two-factor authentication?

If you've had 2FA enabled for more than 14 days, you can't turn it off. If you've had it enabled for less than 14 days, you can turn it off by using the link in the confirmation email. 2FA is not "on a device", it's on your Apple ID.

See this article for more information on how to use it:

Two-factor authentication for Apple ID - Apple Support

You cannot turn off 2-factor unless within 2-weeks of creating the account. You can find out here:

Two-factor authentication for Apple ID - Apple Support

Scroll down to "Can I turn off two-factor authentication after I’ve turned it on?"

If you passed 14 days since turning on 2FA, you cannot turn 8t off.

If you have not passed 14 days, follow the link in the confirmation email

Best Regards,

mdp1101