Not abled to show formatting as track change in aspose words for .NET

I am using aspose words for .NET licensed version 19.2. I am trying to show formatting modifications as track changes while being converted to word but after being converted to word I am not able to see those modifications as track changes. Below is my code which I am trying to execute

finalDocument.StartTrackRevisions( trackChange != null ? trackChange.username : "", trackChange != null ? Convert.ToDateTime(trackChange.created) : DateTime.Now );
r.Font.Bold = true;
r.Font.Name = "Arial";

Can anyone tell me if I am doing anything wrong in above code.

@suchira19 Currently Aspose.Words supports tracking of node insertions and deletions only. Formatting changes are not recorded as revisions.
This feature request is logged as WORDSNET-15792. We will keep you informed and let you know once tracking formatting changes is supported.