Issue with Read Related List Email Content Using Deluge

Hi Team,

I am trying to read all the associated Emails from the Zoho CRM Contacts. I am using to read the Email List using the below API.

https://crm.zoho.com/crm/v2/Contacts/4717204000004249076/Emails?type=5

I got all the emails(Sent from CRM and IMAP Emails) against the contact using the above API. Now, I tried to read the email content of email, using the below API.

https://crm.zoho.com/crm/v2/Contacts/4717204000004249076/Emails/132f1449f5980a34724060b5a529b485259956e62dce72bc928384e219da3860

I can read the email content for the email sent from CRM using above API. But, I unable to read the email content for IMAP emails. I am facing the error like "Insufficient privileges to perform this operation.".

Please help me to resolve this issue.