Could you follow the below steps and get the output of SSO version number:
To determine the version of SSO installed:
- Log in to the server where SSO is installed.
- Click Start> Run, type regedit, and click OK.
- Navigate to HKLM> SOFTWARE> VMware, Inc.> VMware Infrastructure> SSOServer.
- The InstalledVersion Key Name provides the version number of SSO installed. For more information, see the vCenter Inventory Service Revision Number table in the Additional Information section.