The request originated from Ben Kaduk's Discuss ballot on the draft and
suggestion that the URI values be registered.
Some of the relevant messages in the thread:
https://mailarchive.ietf.org/arch/msg/oauth/QiA5PDBsKlApNZIRy3QOttd-JDM
https://mailarchive.ietf.org/arch/msg/oauth/E2eOLE576c_Zw6MK0ys
Hi all
The authors of the token exchange draft asked IANA for an early registration of
URIs and parameters, token types, claims, etc.
IANA asked me for review and I unfortunately do not know (or remember) why this
early registration is needed.
Any reason to do this early registration?
Ciao
Ha