Hello,

while studying draft 01 of the Identity Assertion JWT Authorization Grant,
I started wondering how the fact that the IdP Authorization Server handles
scopes for a different trust domain impacts the ecosystem like the
authorization server metadata.
To my understanding the IdP Authorization Server supports scopes for a
different - possibly multiple - trust domains. Doesn't that affect the
meaning of the scopes_supported property in the authorization server
metadata? Shouldn't the IdP Authorization Server in its authorization
server metadata also include which trust domains and what scopes for those
trust domains it supports? Currently, section 6 "Authorization Server (IdP)
Metadata" only specifies the urn:ietf:params:oauth:token-type:id-jag as a
value for identity_chaining_requested_token_types_supported. I get the
feeling that this is not enough. What do you think?

Best regards,
Judith Kahrer
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