Ensure this property has been set to True or this chart text label will not be displayed. Other reasons why chart text labels may not appear on a chart include:
Multiple ChartTextAppearance objects can apply to the same graphical chart element (identified by the same ( row, column)) and be alternated by toggling their Visible properties such that only one piece of chart text is displayed at once.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2