[OAUTH-WG] Re: Possibly incorrect IANA registry contents for Error Registry

[Warren Parad <[e-mail]>]

Yes it's valid. No it isn't redirectable.

On Sun, Sep 20, 2026, 18:37 Emelia S. <emelia=
[e-mail]> wrote:

> Hi all,
>
> In the OAuth Extensions Error Registry managed by IANA, invalid_client is
> listed as having a usage location of "token endpoint, authorization
> endpoint", citing RFC6749, however, RFC6749's Section 4.1.2.1
> "Authorization Code Grant -> Authorization Response -> Error Response" does
> not list invalid_client.
>
> https://www.iana.org/assignments/oauth-parameters#extensions-error
>
> I'm not sure where the IANA registry contents is from, given that RFC6749
> does not include the initial registry contents. The only place
> invalid_client is listed in RFC6749 is on the token endpoint.
>
> Can someone clarify if `invalid_client` is valid for the authorization
> endpoint and if that error is redirectable?
>
> — Emelia
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