I deployed 25 new machines a few months ago and for the first time used cloning (specifically Acronis), and didnt use sysprep.
After setting up WSUS, only the most recently contacted cloned machine appeared in WSUS.
Starting with one machine, I then used newsid to generate a new SSID (I have confirmed that it has changed). I also changed the PC name and rejoined the domain.
However it is still cycling with the other cloned machines in WSUS.
I have noticed that inside system properties, all the machines show as 'registered to "***-pc-002", including the one i renamed. Not sure if this would affect it (or what to do if it does)