In TDM Portal, using HASHDOB () function for all DOB fields(VARCHAR type) for masking didn't mask the data. The data field has remained unchanged.
Didn't specifying the Date format in HASHDOB() caused the issue.
Release : 4.9
Component : CA Test Data Manager
Specifying the Specific Date format based on the DB in the HashDOB()-->Extra options resolved the issue.
https://techdocs.broadcom.com/us/en/ca-enterprise-software/devops/test-data-management/4-9/reference/masking-functions-and-parameters.html