Azure Maps: Reference Layer Colour Not A Function as Set In Desktop

Hi All,

I have recently implemented a azure map using a reference layer in the Power BI desktop:

And as you can see the fill colour is set by a function - a colour gradient based on a measure. The map functions as expected in the desktop app.

But when I publish the map I just get this:

and if I look at the "edit" options:

The polygons are set to a constant colour and it is not possible to set them as a function. Also hovering over the visual does not display any tooltips.

If I export the data of the visual the data is as expected.

Why is there this difference between desktop and published?