The value of this object is that of cTap2StreamIndex of an
entry in cTap2StreamTable. This object along with
cTap2DebugMediationId identifies an entry in cTap2StreamTable.
The value of this object may be zero, in which this debug
message is regarding a Mediation Device, but not a particular
stream. Note this object may contain a value for which an
entry in cTap2MediationTable does not exist. This happens
when creation of an entry in cTap2StreamTable fails.