App stopped receiving voIP Push notifications.

I am trying to resolve an issue with my app not receiving Push notifications any longer. The

pushRegistry:didReceiveIncomingPushWithPayload:forType:withCompletionHandler:

method was not properly implemented. So far I've tried changing bundle ID, deleting and reinstalling the app. Is there something that could restart the notifications? Here is the current implementation:

:- (void)pushRegistry:(PKPushRegistry *)registry didReceiveIncomingPushWithPayload:(PKPushPayload *)payload forType:(PKPushType)type withCompletionHandler:(void (^)())completion {

  if (type == PKPushTypeVoIP) {
    NSString *uuidString = payload.dictionaryPayload[@"UUID"];
    NSString *handle = [payload.dictionaryPayload valueForKey: @"callerID"];
    NSUUID *uuid = nil;
     
    if (uuidString) {
      uuid = [[NSUUID alloc] initWithUUIDString:uuidString];
    } else { NSLog(@"UUID is nil."); }
     
    [self reportIncomingCall:uuid usingHandle:handle];
     
  }
   
  completion();
}

:- (void)reportIncomingCall:(NSUUID *)uuid usingHandle:(NSString *)handle {
  CXCallUpdate *update = [CXCallUpdate new];
   
  update.remoteHandle = [[CXHandle alloc] initWithType:CXHandleTypeGeneric value:[NSString stringWithFormat:@"%@", handle]];
   
  if (uuid) {
     
  } else { uuid = [NSUUID new]; }
   
  [provider reportNewIncomingCallWithUUID:uuid update:update completion:^(NSError * _Nullable error) {
    if (error == nil) {
      NSLog(@"New incoming call reported to system.");
    } else {
      // handle error
      NSLog(@"Call disallowed by the system, error: %@", error.localizedDescription);
    }
  }];
}