Welcome to the #dominoforever Product Ideas Forum! The place where you can submit product ideas and enhancement request. We encourage you to participate by voting on, commenting on, and creating new ideas. All new ideas will be evaluated by HCL Product Management & Engineering teams, and the next steps will be communicated. While not all submitted ideas will be executed upon, community feedback will play a key role in influencing which ideas are and when they will be implemented.
For more information and upcoming events around #dominoforever, please visit our Destination Domino Page
Update: Based on your additional input I now understand the real problem in your specific configuration. Will get back to you asap.
this is a matter of SAML / IdP configuration outside of Domino. Your SAML/IdP needs to use two directories (or trust two directories). For one internet site you can only have one IdP confirgured. So if it is not possible to harmonize your directory trust relationship at the IdP, then you might want to introduce two URLs to access the same Domino server.