Returns the audiences a receiver is associated with: the identifier it
authenticated as and, for a registered application, its identifier and
every ssfReceiverId on its entry.
Parameters
Optionalprincipal: any
the receiver's authenticated identifier
Returns string[]
the audiences; empty for an unauthenticated caller
Returns the audiences a receiver is associated with: the identifier it authenticated as and, for a registered application, its identifier and every
ssfReceiverIdon its entry.