In this post, you’ll learn more about the Error FVE_E_FS_NOT_EXTENDED – 0x80310047 that is returned when working with the COM-based APIs in Win32
Win32 COM Error
FVE_E_FS_NOT_EXTENDED – 0x80310047
Win32 COM Error Error Description
This drive cannot be encrypted by BitLocker Drive Encryption because the file system does not extend to the end of the drive. Repartition this drive and then try again.