The two-factor authentication
my iMac 2019, iPad 2019, iPhone 7 (13.2.2) don't let me The two-factor authentication! saying that it's not available for my apple ID! Talked to Apple support but they couldn't help either.
iPad 2, iOS 9
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Despite what is said below, I have seen that there are some devices that would appear to be consistent with two-factor authentication that actually aren't.
See Two-factor authentication for Apple ID https://support.apple.com/en-us/HT204915 See this section especially Setup two-factor authentication for your Apple ID. From this section, "Two-factor authentication is available for Apple ID accounts with at least one device that's using the latest iOS, iPadOS, or macOS. Learn more. You can follow these steps on your iPhone, iPad, or iPod touch to turn on two-factor authentication."
And, Use the “learn more” link above to see more about the Availability of two-factor authentication for Apple ID https://support.apple.com/en-us/HT205075