The UnrealIRCd team does not officially provide support for any services packages that you may be using or want to use. This forum is provided so the community can help each other with services issues.
1) How does it not work? You need to provide us with more information than "doesn't work", otherwise we won't know what needs to be fixed.
2) The services-admin flag includes global, so there's no need to define it.
Your flags for unreal, don't automatically give you access to operserv. In order to use /os global, you have to be a services admin or services root
Services Root's are defined int he services.conf file
Services Admins can be added by a root user via /os admin add.
You may want to consult your services documentation on using the global command