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Amit Srivastava give this detail here

Apple forcing developers to use two factors password security and follow these steps to enable it

On your apple device with iOS 9+

1. Go to Settings > iCloud > tap your Apple ID
2. Password & Security
3. Turn on Two-Factor Authentication

On your Mac Pro with OS X El Capitan or later

1. Go to Apple () menu > System Preferences > iCloud > Account Details

2. Click Security

3. Turn on Two-Factor Authentication

If you already use two-step verification, turn it off, then turn on two-factor authentication