It’s not an issue with the version. There must be something else going wrong. We would need the complete, verbatim error message text (not just the 1601… there is additional error text to go along with the 1601 that would explain the reason for the problem) to know what the problem is.
All sorted, a bit embarrassing all the Windows 2016 servers are VM’s which were created
from a template and the one thing that was forgotten was to rename the server so when
adding user & pass as COMPUTERNAME\USER computer name was not as per my information
about the server, have changed all the computer names and all is OK.