Try this one,
set uccx appadmin administrator
Note: Run this command to set the administrators for configured Cisco Unified CCX system only. For new install system, you must login with the platform login password specified during installation.
Hope it helps.
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admin:set uccx appadmin administrator username
UCCX appadmin adminstrator is set to username
Note: You cannot assign Administrator capability to a user ID which is the same as the application administrator user ID created during the Unified CCX installation. If you assign Administrator capability to such a user ID, a Command failed error message is displayed on the console.