Need details about the API for duplicate identification in CDM

Need details about the API for duplicate identification in CDM. Currently, we are using this payload:

{    "hubOrganization": {        "OrganizationName": "Test_1234",        "AddressLine1": "Test_1234",        "City": "Test_1234",        "PostalCode": "560037",        "State": "Test_1234",        "Country": "US"    }}

along with this post command:

crmRestApi/resources/11.13.18.05/hubOrganizations/action/findDuplicates

However, it is giving an empty response whereas when we do duplicate identification from the UI, it gives appropriate result. Need to know the exact details on how to achieve duplicate identification through API.