title: requestUserTokenForDeveloperToken return error - MusicKit get userToken
body: <p>requestUserTokenForDeveloperToken return error</p>
  
  <pre><code>if (@available(iOS 11.0, *)) {
      [self.cloudServiceController requestUserTokenForDeveloperToken:developerToken completionHandler:^(NSString * _Nullable userToken, NSError * _Nullable error) {
  
                              NSLog(@"userToken error - %@", error);
  
                          }];
                      }
  </code></pre>
  
  <p>Error:</p>
  
  <pre><code>Error Domain=SKErrorDomain Code=7 "(null)" UserInfo={NSUnderlyingError=0x1c105e870 {Error Domain=SSErrorDomain Code=109 "(null)" UserInfo={NSUnderlyingError=0x1c105e180 {Error Domain=SSErrorDomain Code=109 "Cannot connect to iTunes Store" UserInfo={NSLocalizedDescription=Cannot connect to iTunes Store, SSErrorHTTPStatusCodeKey=401}}}}}
  </code></pre>
  
  <p>How can I solve this problem? Thx!</p>