How to edit the FME TopoJSON output so that it will open correctly in Microsoft Power BI's Shape Map visualisation?

I would like to make a custom map for Power BI's Shape Map visualisation: https://docs.microsoft.com/en-us/power-bi/visuals/desktop-shape-map

When I make a TopoJSON with FME and open it in Power BI I see a completely filled square (basically the bounding box is filled). When I take the TopoJSON generated by FME and process it using the default paramaters of the online mapshaper tool (https://mapshaper.org/) by exporting as a TopoJSON the mapshaper TopoJSON file open's without a problem in Power BI.

When I compare the FME TopoJSON files to the mapshaper TopoJSON file using a text reader the only obvious difference that I see is that the parameters are in a different order, but the scale and transformation parameters are similar. I have attached the files to this message.

Any ideas on what I need to do with FME so that the outputted TopoJSON files will open in Power BI?