This error occurs when the email you are attempting to assign the role of Case Administrator to is the same as that of the License Administrator. It is not possible to assign the Case Administrator role to an email that already has the License Administrator role.
This scenario can be identified as shown below, where the email address used to log in to the My Account portal matches the email address that was specified when attempting to create a new case administrator.
Assigning the Case Administrator role to the email already set as the License Administrator is not necessary.
For more information about the License Administrator and Case Administrator roles, review KB2211.
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