In this post, you’ll learn about the error “CERTSRV_E_SUBJECT_UPN_REQUIRED 0x8009480D” that is returned when working with COM based APIs or libraries in Windows.
COM Error Message
CERTSRV_E_SUBJECT_UPN_REQUIRED 0x8009480D
What is COM?
Microsoft’s COM stands for Component Object Model. Component Object Model (COM) is a networked, object-oriented framework for building interoperable binary software components. Microsoft’s OLE (compound documents), ActiveX (Internet-enabled components), and other products are built on the COM base technology.
Error Description
Below is the description of this COM Error.
The UPN is unavailable and cannot be added to the Subject Alternate name.
