Hi, There is a way to do this. Here is an outline of the approach: In your proxy_conf.yaml under 'BACKEND_MODULES' configure two (2) SAML backends, eg. BACKEND_MODULES: - "/etc/satosa/plugins/saml2_backend.yaml" - "/etc/satosa/plugins/saml2_backend2.yaml" The two different backend configurations in those files differ in the following ways: a) They should have different values for the 'name' field, eg. 'Saml2' and 'Saml2b' b) They should have different values for assertion_consumer_service. If your configuration bases the URL on <name>, then (a) above will suffice. If you hardcoded the ACS URL then make them differ yourself. c) They should have different values for 'disco_srv' pointing to the discovery services you want each to use. You probably want each backend to use the same value for 'entityid'. If your configuration bases the entityID on <name> then you should force them to be the same entityID. You will need to edit the metadata your SPs see for SATOSA so that the backend has the multiple ACS URLs. In your proxy_conf.yaml in the 'MICRO_SERVICES' configuration add the requester_based_routing.yaml configuration, eg. MICRO_SERVICES: - "/etc/satosa/plugins/requester_based_routing.yaml" Create the configuration for that micro service to map consuming SPs to the different backends, eg. module: satosa.micro_services.custom_routing.DecideBackendByRequester name: RequesterRouter config: requester_mapping: https://sp1.example.org/sp/shibboleth: Saml2 https://sp2.example.org/sp/shibboleth: Saml2b Scott K