diff --git a/backend/services/mochi/server.go b/backend/services/mochi/server.go
index a472e1c..7c23c7d 100644
--- a/backend/services/mochi/server.go
+++ b/backend/services/mochi/server.go
@@ -507,6 +507,7 @@ func (s *Server) sendConnack(cl *Client, reason packets.Code, present bool) erro
 		ServerKeepAliveFlag: true,
 		ReceiveMaximum:      s.Options.Capabilities.ReceiveMaximum, // 3.2.2.3.3 Receive Maximum
 		User:                []packets.UserProperty{{Key: "subscribe-topic", Val: "oktopus/v1/agent/" + clUser}},
+		AssignedClientID:    clUser,
 	}
 
 	if reason.Code >= packets.ErrUnspecifiedError.Code {