Too low OIDC information for debugging

I'm trying to configure OIDC (keycloak) with ssh3.
Following to readme, done authorized_identities and oidc_config.json
`"issuer_url": "https://keycloakdomain/realms/master"`

When trying connect to server with parameters:
`.\ssh3.exe -use-oidc https://keycloakdomain/realms/master user@server/verysecret`

Getting error:
`ERR could not establish SSH3 conversation: no suitable identity found`

Which identity wanted by server? In which scopes and parameters it looking for? Verbose flag can't answer this questions. For now it's impossible to debug this feature :(

Start with the README's OIDC setup, including authorized_identities and oidc_config.json, then trace the handling of the -use-oidc connection and verbose flag. Done should make failed OIDC authentication explain which identity, scopes, or parameters the server expected, so the reported no-suitable-identity error can be diagnosed.

Written by the indexing model from the issue text.