cant turn off the Two-Factor authentication

Two-factor authentication for Apple ID - Apple Support

If you already use 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 recently updated your account, you can unenroll for two weeks. Just open your enrollment confirmation email and click the link to return to your previous security settings. Keep in mind, this makes your account less secure and means that you can't use features that require higher security.

Two-factor authentication for Apple ID - Apple Support

You had to turn it on and set it up.

Once activated, you have 2 weeks to cancel it. After 2 weeks, you can’t turn it off.

After you've set up two factor you have 14 days to turn it off.

What do you mean that it came with it on? Someone set it up.

Is there a specific reason you're trying to turn off two-factor? What specific issue is it causing you? Maybe we can help without turning off two-factor.