After cloning and running NEWSID, cloned computers do not appear in WSUS. This is caused by the Windows Update SUSClientId not being changed in the registry. To resolve this issue, create a batch file with the following content and run on each computer that is not listed in WSUS.
(Note: reg delete statements should be one line ending in /f. These entries may appear on different lines in this posting because they have wrapped.)
net stop wuauserv
reg delete "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate" /v AccountDomainSid /f
reg delete "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate" /v PingId /f
reg delete "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate" /v SusClientId /f
net start wuauserv
wuauclt /resetauthorization /detectnow