Candidate duplicate checks are not coming up for external candidate record?

Summary:

When an internal employee applies for a job through the external career site, the check duplicates for the external record does not display any matching records. Recruiters want to merge these external records with the existing employee profiles, but the system is not showing any duplicates as expected.

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

26A

Code Snippet (add any code snippets that support your topic, if applicable):