Off Topic » Apple Two Factor Authentication: why verification code popup

Hello,

I turned on Two Factory Authentication mode, it worked very well. But yesterday, I reinstalled my Macbook, and iPhone, verification code popup don't automatically display when I login new device. I must get code through text message, or manually getting verification code from iCloud setting. I logged both iPhone, and Macbook, but all don't show popup (I also try to log from another pc but same result).

I’m using Mac OS 10.12.3, and iOS 10.2.1

I think two cases:

1. It's a problem occurred when I reinstalled my device.
2. Someone (may be a "hacker") controlled my apple ID and my devices. (I'm worry about this)

Please Help.

Thanks !

I didn't find the right solution from the internet.

References:
https://www.cnet.com/forums/discussions/...ion-code-popup/

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