[keycloak-user] User Search by Attribute

I am replacing a custom java built IdP build in Spring with Keycloak. Initially I was hoping to leverage Realms as a way to separate users across tenants, unfortunately clients cannot be registered across Realms (AFAIK?). Since I am replacing a user db including some minor attribution with Keycloak, I will need to support fetching users by tenantId. As far as I know this can only be done via user attributes and using client templates to expose those attribute to token primary level objects. My question is.. Is there a way to leverage the Java Client API to search for realm users belonging to a specific tenantId? Ideally…. List<UserRepresentation> users = keycloak.realm("iacuc").users().search(“tenantId:<some uuid>", <start>, <limit>); or List<UserRepresentation> users = keycloak.realm("iacuc").users().search(“attribute:tenantId:<some uuid>", <start>, <limit>); -dana