In this post, you’ll learn more about the Error CERTSRV_E_SUBJECT_EMAIL_REQUIRED – 0x80094812 that is returned when working with the COM-based APIs in Win32
Win32 COM Error
CERTSRV_E_SUBJECT_EMAIL_REQUIRED – 0x80094812
Win32 COM Error Error Description
The EMail name is unavailable and cannot be added to the Subject or Subject Alternate name.