If domains are manually added after SSO is set up and SSO does not auto discover the domains, use the following steps to manually auto discover without using the vSphere Web Client.
Run the ssocli utility. It is located at %ProgramFiles%VMwareInfrastructureSSOServerutils
Open up command prompt, change the directory to the one specified above.
Run the following command:
ssocli configure-riat –verbose –a discover-is –u admin –p <sso password>