All Scaned printer not showing in Assests > Printers

All Scaned printer not showing in Assests > Printers

Hi,
 
I am using ServiceDesk Plus V 8.1.0 Build 8109. Now, I am scanning my network and getting three Thosiba eStudio printers with all information of the printer but that not saving in Assests > Printers.
 
If I tried to add printers manually then getting message that Printer name already exist but that not list in Assests > Printer even selected All printers.
 
Regards,
Prakash

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