A SQL Server 2012 agent job was failing with:
The application-specific permission settings do not grant Local Activation permission for the COM Server application with CLSID {...} and APPID {...} to the user MYDOMAIN\me SID (...) from address LocalHost (Using LRPC). This security permission can be modified using the Component Services administrative tool.
But when I looked in Component Services -> Computer -> My Computer -> DCOM Config -> (APPID above), I found that the local Administrators group already had "Local Activation" permission. I confirmed that my domain user account was a member of local group Administrators.
Nevertheless, to run the job, I had to manually add myself and give myself "Local Activation" authorization. Why is this?