You experience one or more of the following issues following a Symantec Endpoint Protection (SEP) 12.1 RU6 MP5 or higher on Windows 7 to the same, or SEP 14 or higher on Windows 10 migration:
Only the specific migration scenarios outlined in http://www.symantec.com/docs/INFO2746 and http://www.symantec.com/docs/TECH235458 are supported. Specifically, a migration from 12.1 RU6 MP5 to 12.1 RU6 MP8 on Windows 7 to the same version on Windows 10 Fall Creators Update (RS2) or higher is not supported.
SEP 12.1 RU6 MP5 or higher
Windows 10 Fall Creators Update (RS2) or higher
Starting Symantec Endpoint Protection Manager (SEPM) 14, an option to perform a silent CleanWipe immediately prior to the client installation was added to the Client Install Settings section. In this specific scenario, it is recommended to leverage that option. An added benefit of doing so is that it will allow our Early Launch Anti-Malware (ELAM) functionality to work.