Next, If June 2019 NPrinting or later versions are is in use, do the following:
Navigate to the exported certificates location on the QS server and rename the exported file 'client.pfx' with a suitable name. ie: if your Qlik Sense server name is QS1, prepend the file client certificate file name as follows: QS1client.pfx (Naming of this file should ideally reflect the Qlik Sense server that the file was exported from. You may use however, any name that you wish)
Copy this file to the NPrinting server path: "C:\Program Files\NPrintingServer\Settings\SenseCertificates"