Link: https://discussions.apple.com/thread/6985097
Apple was (is) notoriously eager to introduce yet another security layer for the iCloud. Yesterday, I was forced to change my iCloud password, which resulted in some login problem with all of my emails and built in social media accounts on my Mac, even though I have entered the correct password. So with the help of my friend, I decided to log my Mac out the iCloud, and then login back again. The log out process itself was a little bit complex in its own way, but finally I’m able to log out. Then I restart my Mac. After that, I log in my Mac again to the iCloud. The system then tried to activate iCloud features one by one. At the iCloud keychain section, iCloud sent an sms to a number that’s associated with my iCloud, which was a deactivated number. Crap. Trying to change the number itself gave me error “failed to change phone number”. I then tried to find some article to change that number, which I find it here: link.
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