In this post, you’ll learn more about the Error ERROR_VOLMGR_TOO_MANY_NOTIFICATION_REQUESTS – 0xC0380042 that is returned when working with the COM-based APIs in Win32
Win32 COM Error
ERROR_VOLMGR_TOO_MANY_NOTIFICATION_REQUESTS – 0xC0380042
Win32 COM Error Error Description
There is already a pending request for notifications. Wait for the existing request to return before requesting for more notifications.