According to this document, Xerox Product SMB Supported Versions, the WC6605 should support SMB v2. If you have SMB v2 enabled and it does not work, I suggest you download the latest Firmware to see if it fixes you issue. There is a newer version that what yout have on the Xerox.com/support site, Drivers & Downloads - WorkCentre 6605 - Windows 10 x64 - Xerox.
Yes i looked it up and saw that it should support both smb v1 and v2 . I checked the fileshare and smbv2 is enabled on there as well.
I clicked on the link you provided and the printer already has that firmware installed on it but i went ahead and installed it again anyways and i am still get the same issue. getting a log in error when trying to scan, saying it cant connect to smb server.
when i look at the setting for the printer on the webpage under properties. in the cofig for smb client for smb protocol it only give me the option to slect either smbv1 or *auto, which was already set to *auto.