How do I disable two factor authentication?
it seems that on appleid.apple.com the option is disabled and i cannot turn it off.
any workaround if i own only mac and not iphone?
MacBook Air 13", macOS 10.14
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See the following from 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.
Also note that two-factor should work with no issues when you have one Mac and no iPhones. The two-factors are your password and the authentication code, not two devices. The code should display on your Mac when needed. You can also have one o more trusted phone numbers and they can be any phone, including Androids and landlines. There are more details in Two-factor authentication for Apple ID - Apple Support