Windows Server cannot join an Active Directory domain due to duplicate SID’s

A Windows error: “The domain join cannot be completed because the SID of the domain you attempted to join was identical to the SID of this machine. This is a symptom of an improperly cloned operating system installation. Run sysprep on this machine in order to generate a new machine SID.

Solution:

Run sysprep.exe in a Command Prompt window to generate a new SID.
1. Type c:\windows\system32\sysprep\sysprep.exe /oobe /generalize /reboot and press Enter in the Command Prompt window to change the SID and run OOBE.

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