SAML plugin and non standard configuration

SSO
1

Hi,
does anyone have experience with self-hosted Discourse and SAML plugin with non-standard configuration?

I would like to configure parameters to use existing SAML attributes (completely different than the SAML plugin think it is standard), but even I configured they in a configuration environment like plugin documentation show, I got blank page on URL https://host.name/auth/saml/callback, and standard log said :

(saml) Setup endpoint detected, running now.
(saml) Request phase initiated.
Started POST "/auth/saml/callback" for 192.168.3.178 at 2024-09-30 06:52:20 +0000
(saml) Setup endpoint detected, running now.
(saml) Callback phase initiated.

Adding :

  DISCOURSE_SAML_LOG_AUTH: true
  DISCOURSE_SAML_DEBUG_AUTH: true

doesn’t help at all (I check and that variable is set in container environment) .

Additionally, I may confirm that every steps before in SAML authentication was done correctly and plugin got on callback URL correct SAML messages (just info we have almost 400+ SP using that IdP services without issues).

Any suggestion ?

Dubravko