* `m.login.jwt`, which was never specced and has been deprecated since Synapse 1.16.0. (`org.matrix.login.jwt` can be used instead.) * `uk.half-shot.msc2778.login.application_service`, which was stabilized as part of the Matrix spec v1.2 release.
Allows specifying a different claim (from the default "sub") to use when calculating the localpart of the Matrix ID used during the JWT login.
iss
aud