diff --git a/lib/components/secondary-device-qr-auth-context-provider.react.js b/lib/components/secondary-device-qr-auth-context-provider.react.js
--- a/lib/components/secondary-device-qr-auth-context-provider.react.js
+++ b/lib/components/secondary-device-qr-auth-context-provider.react.js
@@ -150,13 +150,25 @@
     }
 
     void (async () => {
-      const message = await composeTunnelbrokerQRAuthMessage(qrData?.aesKey, {
-        type: qrCodeAuthMessageTypes.SECONDARY_DEVICE_REGISTRATION_SUCCESS,
-      });
-      await sendMessageToDevice({
-        deviceID: primaryDeviceID,
-        payload: JSON.stringify(message),
-      });
+      try {
+        const message = await composeTunnelbrokerQRAuthMessage(qrData?.aesKey, {
+          type: qrCodeAuthMessageTypes.SECONDARY_DEVICE_REGISTRATION_SUCCESS,
+        });
+        await sendMessageToDevice({
+          deviceID: primaryDeviceID,
+          payload: JSON.stringify(message),
+        });
+      } catch (e) {
+        // QR auth already succeeded at this point. If sending this message
+        // fails, primary device will timeout and display the "Device not
+        // responding" screen, but user can ignore it because the device
+        // is functional and working
+        const errorMessage = getMessageForException(e);
+        console.log(
+          'Failed to send registration success message:',
+          errorMessage,
+        );
+      }
       setQRAuthFinished(true);
       setQRData(null);
     })();