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Re:Apple Is Blocking Linux User-Agent on appleid.apple.com by yohannparis on Friday February 22, 2019 @10:45AM (#19226259)
It happened to me when I changed country and phone number, I couldn't identified my iCloud account.

I just follow the instructions on the login page that I did not have my device with me, and just entered my Recovery Key that was given to me when I setup 2FA.

It's as simple as that.

Mind you I use a password manager and keep all my login information in it.

Re:Apple Is Blocking Linux User-Agent on appleid.apple.com by throwaway45901 on Friday February 22, 2019 @12:22PM (#19227081)
Note that the “recovery key” is for the older “2 step verification.”

The newer “2 factor verification” does not have a recovery key.