Brian is correct and it’s an outstanding item (and errata) that needs to be completed.

Kind Regards,
Bjorn

On May 22, 2026, at 9:14 AM, Brian Campbell via Openid-specs-mobile-profile <[email protected]> wrote:


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 are missing from the Dynamic Client Registration Metadata registry. 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 are all present in the 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
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