Printing via Job Queue Server Printers - NAV 2016

Hi Folks -

I am continuing my previous issue which I posted few days ago, our customer have Microsoft NAV server installed on SQL box and our customers IT person has installed the printer on the SQL box and made the printer as default printer. Still it does not show on the list of printers when they try to schedule the report to print. What is being missed out. They have SQL server 2012.  What is being missed out, any help is greatly appreciated.  Thanks Regards RJ.