Apple has emailed customers who still use the older Two-Step Verification protection for their Apple ID, telling them that installing iOS 11 or macOS High Sierra will automatically upgrade them to the more robust Two-Factor Authentication system.
Two-Factor Authentication strengthens the security of your Apple ID by preventing anyone from accessing or using it, even if they know your password. With Two-Factor Authentication, one of your trusted devices generates a one-time code when you make a purchase or sign in to your Apple ID, iCloud, iCloud.com, iMessage, FaceTime or Game Center account on a new device. Two-Factor Authentication is also required for Auto Unlock so you can unlock your Mac by wearing an Apple Watch.
In this tutorial we’ll show you how to protect your Apple ID with Two-Factor Authentication or, if you’re still using the older and less secure Two-Step Verification, upgrade to Two-Factor Authentication.
Some folks with iOS 10 beta 2 installed on their iPhone are finding that they’ve been locked out of their Apple ID account, unable to perform a password reset. As per a new thread on Reddit, the problem seems to affect a portion of iOS 10 beta 2 users whose Apple ID account has been protected with Apple’s two-step authentication system, which requires both a password and a one-time six-digit code when using iCloud on a new device.
We’re posting this as convenience for those who have been affected. If you’re seeing this, you probably don’t need to worry about your Apple ID being hacked and unrecoverable, it’s just a bug in iOS 10 beta 2.