add handling for error and successful return

src/services/NotificationService.ts

@@ -111,10 +111,12 @@ export class NotificationService {
     });
     const json = await response.json();
 
-    // Check whether it was successful
-    // Return the result
+    if (response.status !== 200) {
+      console.error(`Notification failed for device ${deviceId}:`, json.reason);
       return false;
     }
+    return true;
+  }
 
   private getAPNsFullUrlToUse(deviceId: string) {
     // Construct the fetch request