Problems with user ID received by email of lead and contact

Problems with user ID received by email of lead and contact

Good day!

Please advise what is done wrong/

Using API request
https://crm.zoho.com/crm/private/xml/Leads/getSearchRecordsByPDC?newFormat=1&authtoken=7cf3dc5a102d79c9d627ee39abafc024&scope=crmapi&
searchColumn=email&searchValue= ice6ice@mail.ru&selectColumns=Leads(Email)

I would like to receive user ID by email. When I substitute LEAD email, for example  ice6ice@mail.ru, everything is OK, I get ID number in response.

But if I insert CONTACT email, there is error responded


Question is: Why I am not receiving CONTACT ID if requests are the same as for LEAD. What should be done to receive CONTACT ID using email address.


If you click on the first link - There is ID number 1345147000000238007 shown
If you click the second link - There is no data to show although the difference is only in the status of email.