We own other domains for separate parts of our organization and would like to have them under the one roof of Google Apps for Education. We are integrated with Google Apps for Education, and it is currently impossible to use Populi as the SSO for the secondary domain. Likewise, it is impossible for Populi to ignore the secondary domain in an integrated environment. However, it appears that Google can support SSO for the primary domain only. The admin interface says the following:
"You can have SSO for both your primary and secondary domain. If you enable the check box for 'Use a domain specific issuer', only your primary domain will have SSO. If you do not enable the check box for 'User a domain specific issuer', SSO will be enabled for both your primary and secondary domains."
We tested it but it doesn't yet work with Populi. It would be great if it could be made to work for the primary domain only!