Rpcclient generates errors when trying to add the driver to samba?

Good day!

Raised Samba, caps, printers print, with Windows on SMB shared printers see and can connect, create the folder //server/print$ available. But when I run rpcclient adddriver then complains with error NT STATUS UNSUCCESFUL. when you run rpcclient -Uroot localhost complains with error NT STATUS ACCESS DENIED. I want to raise the print server to cups with autorizacia drivers. All commands are executed on the server root. Prompt where to dig? Thanks in advance
Server ubuntu 18.04
cups 2.2.7
camba 4.7.6