I believe the answer lies toward the end of the comments on https://bitbucket.org/openid/mobile/issues/206/ciba-iana-actions
On Thu, May 21, 2026 at 3:52 PM Max Gerber <mgerber= [email protected]> wrote: > Hey folks, > > I noticed that the fields in OpenID CIBA § 16.2 > <https://openid.net/specs/openid-client-initiated-backchannel-authentication-core-1_0.html#rfc.section.16.2> > are > missing from the Dynamic Client Registration Metadata registry > <https://www.iana.org/assignments/oauth-parameters/oauth-parameters.xhtml#client-metadata>. > Does anybody know why? > > Specifically: > - backchannel_token_delivery_mode > - backchannel_client_notification_endpoint > - backchannel_authentication_request_signing_alg > - backchannel_user_code_parameter > > Interestingly, the corresponding AS Metadata fields in §16.1 > <https://openid.net/specs/openid-client-initiated-backchannel-authentication-core-1_0.html#ietf-oauth-discoveryIANA> > are > all present in the Authorization Server Metadata > <https://www.iana.org/assignments/oauth-parameters/oauth-parameters.xhtml#authorization-server-metadata> > registry: > > - backchannel_token_delivery_modes_supported > - backchannel_authentication_endpoint > - backchannel_authentication_request_signing_alg_values_supported > - backchannel_user_code_parameter_supported > > Best, > Max > _______________________________________________ > OAuth mailing list -- [email protected] > To unsubscribe send an email to [email protected] > -- _CONFIDENTIALITY NOTICE: This email may contain confidential and privileged material for the sole use of the intended recipient(s). Any review, use, distribution or disclosure by others is strictly prohibited. If you have received this communication in error, please notify the sender immediately by e-mail and delete the message and any file attachments from your computer. Thank you._
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