The OAuth Token Binding specification has been revised to use the Referred Token Binding ID when performing token binding of access tokens. This was enabled by the Implementation Considerations in the Token Binding HTTPS specification being added to make it clear that Token Binding implementations will enable using the Referred Token Binding ID in this manner. Protected Resource Metadata was also defined.
Thanks to Brian Campbell for clarifications on the differences between token binding of access tokens issued from the authorization endpoint versus those issued from the token endpoint.
The specification is available at:
An HTML-formatted version is also available at: