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You can also change the iCloud Security Code or the phone number used to verify your identity after you use the iCloud Security Code. Choose Apple menu > System Preferences, then click iCloud. Make sure Keychain is on and your Mac is approved.

  www.MacObserver.com

“How can I recover my iCloud Security Code?

  www.macworld.com

There are two methods for changing your security code. The first assumes that you're using a Mac that is already set up to use iCloud Keychain. This is the preferred method for changing the security code.

  www.lifewire.com

On your iphone – Setting > iCloud > Keychain. Approve with security code on the passcode step. Click ‘forgot code’ and then click ‘reset’.

  martintjandra.wordpress.com

Forgot your Security Code for iCloud Keychain

  support.apple.com

Slide iCloud Keychain to the "On" position. It will turn green. If prompted, enter your Apple ID and password.

  www.wikihow.com

“Your iCloud Security Code has been entered too many times. Approve this Mac from one of your other devices using iCloud Keychain.

  turbofuture.com

It asked my iCloud security code and after it asks for 6 digit verification code that has been sent to my old phone number that I no longer have access to.

  apple.stackexchange.com