title: iOS NotificationServiceExtension is not working
body: <p>I have enabled NotificationServiceExtension in my app. And done the following</p>
  
  <ol>
  <li>Added .apppex under Frameworks, Libraries and Embedded contents</li>
  <li>Confirmed both deployment target version is 12.0</li>
  <li>Sending mutable-content": 1 in my apns notification payload</li>
  <li><p>Following is my NotificationService's <strong>didReceiveNotificationRequest</strong> method</p>
  
  <pre><code>- (void)didReceiveNotificationRequest:(UNNotificationRequest *)request withContentHandler:(void (^)(UNNotificationContent * _Nonnull))contentHandler {
  
  self.bestAttemptContent = [request.content mutableCopy];
  
  self.bestAttemptContent.badge = @20;
  self.contentHandler(self.bestAttemptContent);
  </code></pre>
  
  <p>}</p></li>
  </ol>
  
  <p>Don't know what I am missing here. Searched and followed so many documents. Nothing seems to be working.</p>
  
  <p>I am using XCode 11.2.1 and  real device with ios version 13.</p>