adfs event id 364 no registered protocol handlers
After 5 hours of debugging I didn't trust postman any longer (even if it worked without issues for months now) and used a short PowerShell script to invoke the POST with the access code: Et voila all working. In this instance, make sure this SAML relying party trust is configured for SHA-1 as well: Is the Application sending a problematic AuthnContextClassRef? By default, relying parties in ADFS dont require that SAML requests be signed. https://