Dynamic Distance Map Help

I'm following the https://dataveld.com/2019/03/20/display-points-within-a-distance-radius-on-a-power-bi-map/ to create points within a distance radius on a simple pbi map. I have everything working except the Map Point Size is not working which then doesn't display any points on the map. Below is the map point size measure. Do I need to change something to get my points to show up on the map. According to  David Eldersveld, the map point size is a parameter for a variable distance threshold. With this parameter factoring into a size measure, it shows only points that fall within the user-selected maximum distance. All points the don’t meet the IF condition do not display on the map. When I take off the map point size under size the dots show up but then the distance slider won't work. 

Map Point Size =

IF([Distance (mi)] <= [Maximum Distance (mi) Value],

IF(HASONEFILTER('Selector'[City]),

SWITCH(TRUE(),

[Distance (mi)] = 0,1,

0.25

),

1

),0)

 

Without the map point size

 

 With map point size under size