Turn off two factor authentication
How do you turn it off
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In your iCloud account settings on your iPhone or iPad, the option will show if it is still available. If there is no option to turn it off, then it is now permanently enabled.
Two-factor authentication for Apple ID - Apple Support
“Can I turn off two-factor authentication after I’ve turned it on?
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 within two weeks of enrollment. 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.“