The Issue was users were not able to see the reports published through N-Printing in Hub. So ticket was raised with Qlik Support under the title (02164064 - QLIK N PRINTING REPORTS NOT VISIBLE TO USERS). As per the comments that we have received from Qlik Support.
"The domain users are able to access the reports in the QlikSense without any issues. As I have previously mentioned it is one of the requirements to enable distribution of Qlik NPrinting reports to the Qlik Sense hub. In your case you want the users from virtual proxy configured in IBM ISAM to be able to view the Nprinting reports distributed to QlikSense hub."
Kindly include this feature in the product.