I have this setup:
In I can see numbers if I go on top with mouse:
So why my map has only city names and not numbers? As far as I know this is driven by "Data Label Position" which is "Center" like highlighted above
@Stefano_Mazzocca
In the Data Layers panel, try selecting the options under Columns (right below Data Labels Position). Here's a screenshot of what I did in one of my workbooks. You can also change the setting for Multi Line to have the measure show on a separate line.
