diff --git a/services/tunnelbroker/rust-notifications/src/apns.rs b/services/tunnelbroker/rust-notifications/src/apns.rs
--- a/services/tunnelbroker/rust-notifications/src/apns.rs
+++ b/services/tunnelbroker/rust-notifications/src/apns.rs
@@ -9,6 +9,7 @@
   certificate_path: &str,
   certificate_password: &str,
   device_token: &str,
+  topic: Option<&str>,
   message: &str,
   sandbox: bool,
 ) -> Result<()> {
@@ -21,6 +22,7 @@
   let client =
     Client::certificate(&mut certificate, certificate_password, endpoint)?;
   let options = NotificationOptions {
+    apns_topic: topic,
     ..Default::default()
   };
   let builder = PlainNotificationBuilder::new(message);
diff --git a/services/tunnelbroker/rust-notifications/src/lib.rs b/services/tunnelbroker/rust-notifications/src/lib.rs
--- a/services/tunnelbroker/rust-notifications/src/lib.rs
+++ b/services/tunnelbroker/rust-notifications/src/lib.rs
@@ -12,6 +12,7 @@
       certificate_path: &str,
       certificate_password: &str,
       device_token: &str,
+      topic: &str,
       message: &str,
       sandbox: bool,
     ) -> Result<()>;
@@ -35,6 +36,7 @@
   certificate_path: &str,
   certificate_password: &str,
   device_token: &str,
+  topic: &str,
   message: &str,
   sandbox: bool,
 ) -> Result<()> {
@@ -42,6 +44,7 @@
     certificate_path,
     certificate_password,
     device_token,
+    if topic.is_empty() { None } else { Some(topic) },
     message,
     sandbox,
   ))