checkAndPerformV1TokenMigration

I add a fuction with named checkAndPerformV1TokenMigration as following :

-(void)performDropboxMigrationFromV1ToV2
{
  BOOL willPerformMigration = [DBClientsManager checkAndPerformV1TokenMigration:^(BOOL shouldRetry, BOOL invalidAppKeyOrSecret,
                                                                                  NSArray<NSArray<NSString *> *> *unsuccessfullyMigratedTokenData) {
    if (invalidAppKeyOrSecret) {
      // Developers should ensure that the appropriate app key and secret are being supplied.
      // If your app has multiple app keys / secrets, then run this migration method for
      // each app key / secret combination, and ignore this boolean.
    }
    
    if (shouldRetry) {
      // Store this BOOL somewhere to retry when network connection has returned
    }
    
    if ([unsuccessfullyMigratedTokenData count] != 0) {
      NSLog(@"The following tokens were unsucessfully migrated:");
      for (NSArray<NSString *> *tokenData in unsuccessfullyMigratedTokenData) {
        NSLog(@"DropboxUserID: %@, AccessToken: %@, AccessTokenSecret: %@, StoredAppKey: %@", tokenData[0],
              tokenData[1], tokenData[2], tokenData[3]);
      }
    }
    
    if (!invalidAppKeyOrSecret && !shouldRetry && [unsuccessfullyMigratedTokenData count] == 0) {
      [DBClientsManager setupWithAppKey:DROPBOX_APP_KEY];
    }
  } queue:nil appKey:DROPBOX_APP_KEY appSecret:DROPBOX_APP_SECRET];
  
  if (!willPerformMigration) {
    [DBClientsManager setupWithAppKey:DROPBOX_APP_KEY];
  }
}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { 
  [self performDropboxMigrationFromV1ToV2];

  // Do I still need add following line code: 
  // [DBClientsManager setupWithAppKey:@"<APP_KEY>"]; ??

  return YES; 
}

I perform the function  in didFinishLaunchWithOption function but after taht.

Do I still need add [DBClientsManager setupWithAppKey:@"<APP_KEY>"] indidFinishLaunchWithOption ??