Can't get map to display data

Hi, i've been trying to get a basic map showing data on Power BI service, but having no luck.

I started in Power BI desktop. I have a simple table of suburb data with a computed LatLong field:

If i drop the LatLong field onto the "Location" entry on a map visualization on desktop, it displays fine: (TotalCurrentListings used as size/saturation)

So all good on desktop. When i publish to Power BI service however, it doesn't work. (map displays no data).

After switching to the table visualization to inspect the data, it shows there's no data for the LatLong field:

Which i guess explains why the map shows nothing. But why isn't this data being synced?

Can someone please help?

Thanks