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The issue is caused when a user who was listed as an Employee in CA leaves the company, their Active Directory (AD) account is deleted, and the user then rejoins the company with a new AD account having the same username as their previous deleted AD account. This new AD account will have a different AD security identifier (SID). As the user's previous Employee information, including the username and SID, is present in CA, the Employee Synchronization process tries to synchronize the username and AD SID, but fails to do so as the AD SID is different.
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The fix for this issue will require the CA Customer database to be updated with the user's new information. In preparation for the update, please backup the CA Customer database. Then contact Technical Support for assistance with this issue.