diff --git a/lib/types/tunnelbroker/message-to-device-request-status-types.js b/lib/types/tunnelbroker/message-to-device-request-status-types.js
--- a/lib/types/tunnelbroker/message-to-device-request-status-types.js
+++ b/lib/types/tunnelbroker/message-to-device-request-status-types.js
@@ -18,6 +18,7 @@
 type MessageSentSuccessStatus = { +type: 'Success', +data: string };
 type MessageSentErrorStatus = { +type: 'Error', +data: Failure };
 type MessageSentInvalidRequestStatus = { +type: 'InvalidRequest' };
+type MessageSentUnauthenticatedStatus = { +type: 'Unauthenticated' };
 type MessageSentSerializationErrorStatus = {
   +type: 'SerializationError',
   +data: string,
@@ -38,6 +39,9 @@
     data: failureValidator,
   }),
   tShape<MessageSentInvalidRequestStatus>({ type: tString('InvalidRequest') }),
+  tShape<MessageSentUnauthenticatedStatus>({
+    type: tString('Unauthenticated'),
+  }),
   tShape<MessageSentSerializationErrorStatus>({
     type: tString('SerializationError'),
     data: t.String,
diff --git a/shared/tunnelbroker_messages/src/messages/message_to_device_request_status.rs b/shared/tunnelbroker_messages/src/messages/message_to_device_request_status.rs
--- a/shared/tunnelbroker_messages/src/messages/message_to_device_request_status.rs
+++ b/shared/tunnelbroker_messages/src/messages/message_to_device_request_status.rs
@@ -9,6 +9,8 @@
   pub error: String,
 }
 
+// NOTE: Keep this in sync with
+// lib/types/tunnelbroker/message-to-device-request-status-types.js
 #[derive(Serialize, Deserialize, PartialEq, Debug)]
 #[serde(tag = "type", content = "data")]
 pub enum MessageSentStatus {
@@ -29,6 +31,8 @@
   SerializationError(String),
 }
 
+// NOTE: Keep this in sync with
+// lib/types/tunnelbroker/message-to-device-request-status-types.js
 #[derive(Serialize, Deserialize, PartialEq, Debug)]
 #[serde(tag = "type", rename_all = "camelCase")]
 pub struct MessageToDeviceRequestStatus {