In this post, you’ll learn more about the Error FVE_E_NON_BITLOCKER_KU – 0x80310093 that is returned when working with the COM-based APIs in Win32
Win32 COM Error
FVE_E_NON_BITLOCKER_KU – 0x80310093
Win32 COM Error Error Description
The Key Usage (KU) attribute of the specified certificate does not permit it to be used for BitLocker Drive Encryption. BitLocker does not require that a certificate have a KU attribute, but if one is configured it must be set to either Key Encipherment or Key Agreement.