In our environment, we have two AD forests. We have the majority of our users in one forest, but there are users in another forest that also use IBM Notes. Can I set up Domino to use Microsoft Active Directory Federated Services (ADFS) as the federation for a Domino partner to two different forests?
Subject: I don’t believe that has been tested
However, if you had separate idpcat.nsf entries that each point to the respective ADFS relying trust configurations in the separate forests/domains, then I don’t see why it wouldn’t work. You’d need to segment your Domino users into two different ID vaults, each of which specifying one of your two IdP configurations.