Shibboleth Service Provider Configuration for Single app for?multiple sub domains with Different IDP's

[Peter Schober]

* Randy Wiemer <wiemerr at hotmail.com> [2012-10-28 04:04]:
> The counter example is Sales Force which uses a feature they call
> “My Domains”, which is a subdomain per customer, to handle the IdP
> discovery process.

It doesn't handle IDP discovery. You'll need to know the specific
entry point into the service from somewhere else (which hardcodes the
IdP, practically), instead of the subject just going to Service A and
selecting where to log in,
-peter