You can add new domains or subdomains to your initial enterprise federation setup from the Enterprise Federation dashboard.
Restriction: There is one restriction that applies to adding domains to a direct federation setup: if you are using
Username@Domain as identification preference for users login, you are not allowed to add more domains or subdomains to the existing federation setup.
Each domain or subdomain that you add to your existing enterprise federation setup must pass verification of the domain's ownership and verification of user login using your corporate identity provider.
Note: After you add a domain or subdomain to the federation setup, it can no longer be modified or removed. If you have to make a change, you must file a support ticket.
Prerequisites
To make changes to the initial federation setup, you must be logged in the Management Organization for your enterprise as an Enterprise Administrator.