Lost Recovery Key
how do I retrieve my apple recovery key when my apple id is Locked
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If you lost your recovery key, and don't have access to any trusted devices. You cannot regain access to your account.
How to generate a recovery key - Apple Support
Using a recovery key is more secure, but it means that you’re responsible for maintaining access to your trusted devices and your recovery key. If you lose both of these items, you could be locked out of your account permanently.