In this post, you’ll learn more about the Error FVE_E_POLICY_USER_CERTIFICATE_REQUIRED – 0x80310073 that is returned when working with the COM-based APIs in Win32
Win32 COM Error
FVE_E_POLICY_USER_CERTIFICATE_REQUIRED – 0x80310073
Win32 COM Error Error Description
Group Policy settings require that you have a valid user certificate, such as a smart card, to be used with BitLocker Drive Encryption.