Sure. That's possible.
https://tools.ietf.org/html/draft-ietf-oauth-rar-01#section-3.1 states
"The request parameter can be used to specify authorization
requirements in all places where the "scope" parameter is used for
the same purpose, examples include:
…
Access token requests as specified in [RFC6749], if also used as
authorization requests, e.g. in the case of assertion grant types
[RFC7521]”
I filed a ticket to also mention this in the token request section.
> On 14. May 2020, at 11:04, Matthew De Haast <[email protected]>
> wrote:
>
> RFC6749 allows scopes to be presented at the token endpoint for cases like
> client credentials grants.
>
> It's not clear how this could be achieved with the current RAR spec though
> when a Client using Client Credentials wants to request fine grained access
> using authorization_details. Or should this even be possible?
>
> Matt
>
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