TWO FACTOR AUTHENTICATION
I just got a new iPhone and tried to sign into my previous Apple ID but the code for the two-factor authentication will not pop up on my other phone on which I have the number for confirmation.
iPhone 14 Pro Max
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From: Get a verification code and sign in with two-factor authentication - Apple Support
A code is sent first to your trusted devices automatically:
"If you have a trusted device running iOS 9 and later, OS X El Capitan and later, iPadOS 13 and later, or watchOS 6 and later, the verification code is displayed automatically on your trusted devices."
If you don’t have a trusted device handy, you can choose to have a verification code sent to your trusted phone number as a text message or phone call.
1. Click "Didn't get a verification code" on the sign in screen.
2. Choose to have the code sent to your trusted phone number.
3. You'll get a text message or phone call from Apple with your verification code. This text message might include an additional domain validation line. This line includes the @ symbol, the website name, and your code (for example: @icloud.com #123456 %apple.com).
4. Enter the code on your other device to complete sign in.
"If you can’t receive a verification code on your trusted devices automatically, you can get one from Settings, even if your device is offline."
On a mobile device go to Settings > [your name] > Tap Password & Security > Get Verification Code.
On a Mac: Go to Apple menu > System Preferences [System Settings], then click Apple ID. Click Password & Security > Get Verification Code.