I need to replace the URL for the "Home" tab to point to the "Sales Activity Social Dashboard" in the Sales Hub D365 Unified Interface...
I can't locate this anywhere in the Site Map...
Where do I locate this at?
That is an user personalization setting, each CRM user has to click the gear icon from the top right menu, then click the "Personalization Settings" and on the popup screen - set the "Default Pane" and "Default Tab". This will act as the "Home" for the user. Read more
You can utilize the XrmToolBox - User Settings Utility to do Admin update for users in bulk.