I installed Multi-Domains. Following the directions successfully including upgrading to a dedicated IP address. But the single signon was still not working, even though it was setup properly in settings with both domains added as "public".
The next suggestion in the problem solving directions was to get my hosting service to configure WPMU virtualhost to be the default for my dedicated IP. My hosting service is Bluehost. They enable me to manage my setup using C-Panel. And they tell me that this is beyond their knowledge and scope (see script from Live Chat session on topic below).
The screenshot showing how to configure the domains on "my server" do not use C-Panel nor C-Panel jargon. C-Panel does have DNS Zone Editor. Do I configure here? Can you provide explicit C-Panel instructions on how to get this done.
--- Live Chat Script --- BELOW ---
[Initial Question] Provider: Bluehost - My Domain is: "businessprojectsexchange.com" need to configure WPMU virtualhost to be the default for my dedicated IP... not sure how
(12:56) [Benjamin B.] Okay, that's not something I can assist you with.
(12:56) [mark] do you know who can?
(12:57) [Benjamin B.] https://premium.wpmudev.org/support/
(12:58) [mark] does c-panel give me sufficient control that configure from there?
(12:59) [mark] wpmu directions said to have you host configure it... that is why i am asking.
(13:0) [mark] if i understand you correctly, you are saying that it is not something configured by bluehost. correct?
(13:0) [mark] and you are suggesting that i should be able to do this on my own with wpmu support?
(13:0) [Benjamin B.] You load the software on our server, we don't configure it for you though
(13:1) [mark] including dns?
(13:2) [Benjamin B.] If you want to edit your DNS records you do that by clicking on the DNS Zone Editor in your cPanel
(13:2) [mark] ok. i will go back to wpmu. thanks.