Candidate was able to create 2 Candidate Profiles that has the same email address and was able to apply to the same job requisition.
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SAP SuccessFactors Recruiting Management
Reason why Candidate was able to create two Candidate Profiles with the same email is because the Candidate created the 2nd profile using a different email address and changed it to the one she applied initially, to confirm this, you may need to check the Candidate History of both the Candidate Profile:
2nd Candidate: Notice the email change
Confirm with Candidate which profile they wish to proceed and either merge the two duplicate profiles or move the other one to a disposition status.
2103863 - Manage Duplicate Candidates - Recruiting Management
Duplicate Candidates, e-mail , KBA , LOD-SF-RCM-CAP , Candidate Profiles , Problem