Upon client initiation of a OIDC Authorization Code Flow for a regional user, federation is performed as shown below.
The sequence diagram described for clinicians https://ehealth-dk.atlassian.net/wiki/spaces/EDTW/pages/101122074/Login#Clinical-logins explains the order in which the OIDC Authorization Code Flow is redirected to a series of OIOSAML-based AuthNRequest and AuthNResponse.