diff --git a/src/transport/GroupSession.h b/src/transport/GroupSession.h
index dee5d6f5de5e1c..b90d966a528f70 100644
--- a/src/transport/GroupSession.h
+++ b/src/transport/GroupSession.h
@@ -40,10 +40,11 @@ class GroupSession : public Session
 
     Access::SubjectDescriptor GetSubjectDescriptor() const override
     {
-        Access::SubjectDescriptor isd;
-        isd.authMode = Access::AuthMode::kGroup;
-        // TODO: fill other group subjects fields
-        return isd; // return an empty ISD for unauthenticated session.
+        Access::SubjectDescriptor subjectDescriptor;
+        subjectDescriptor.authMode    = Access::AuthMode::kGroup;
+        subjectDescriptor.subject     = NodeIdFromGroupId(mGroupId);
+        subjectDescriptor.fabricIndex = GetFabricIndex();
+        return subjectDescriptor;
     }
 
     bool RequireMRP() const override { return false; }