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When enrolling in MDM you may get this error if you had previously used the same email address as a non managed id.

e.g. example.com was transferred to Apple Business managed ids, now your old my@example.com Apple ID needs to be removed so you can use the managed version.

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To work around this issue:

  • open https://appleid.apple.com, login with your old Apple ID and change the email to a new address (eg. my@example2.com)
  • on the Mac/iPhone with the issue, add this new Apple Id as a secondary iCloud account
  • enroll with your Managed Apple ID
  • remove the my@example2.com Apple ID from the device (which can now be deleted)
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