Thank you for your help. I looked into printers.conf.
There is a line stating
Explanation to this line
user = my defined user ID
password = my defined password
router = correct name of my router (not the IP)
My HP Officejet Pro printer is always quoted that way, seems to be right.
The problem is during setup the printer will be found but it won't print stating "NT status disk operation failed opening remote spool