Using us_county_fips for visualization maps

Hi,

I’m attempting to use the map_layer_name of us_county_fips to map counties, and I can’t seem to get it to work properly. The county codes are in the correct FIPS format, but not generating on the visualization, as seen here:

I’ve ensured that the LookML is set up in the same format as the examples I’ve found as well:

dimension: county_mapping_code {

type: string

sql: ${county_fips} ;;

map_layer_name: us_counties_fips

}

Any ideas?