KPI's Icons not exporting to PDF or PowerPoint

Hi All

I have a simple table in a Project report showing project related KPI's and a traffic light system. In PowerBI this is all working and we have no issues. I try to export the page to either pdf or PowerPoint, and I can't get the icons to show 

POWER BI

Exported Result

The above screenshot was from Edge. If I do this from a different browser I get a square box. 

Additionally if I open the report in PowerBI Desktop and export the entire report to pdf the Icons work. 

Does anyone have a resolution 

Kind Regards