Apple ID not supported - Use a Managed Apple ID Error

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 [email protected] Apple ID needs to be removed so you can use the managed version.

Solution 1:

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. [email protected])
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 [email protected] Apple ID from the device (which can now be deleted)

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