Similar discussion here > This email address is not available for use as an Apple ID
why does apple say my email address is not available?
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Similar discussion here > This email address is not available for use as an Apple ID
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If your e-mail address was associated with the ID in any way, for example as a Reachable at or Rescue e-mail address, then it can't be reused with another Apple ID for approximately one year. You will need to get another e-mail address to use as your Apple ID.
why does apple say my email address is not available when changing it