Update power-bi-visual-geocode.md with state/county note

Author: andrewku0409

articles/azure-maps/power-bi-visual-geocode.md

@@ -42,6 +42,13 @@ To ensure fields are correctly geocoded, you can set the Data Category on the da
 
 :::image type="content" source="media/power-bi-visual/data-category.png" alt-text="A screenshot showing the data category drop-down list in Power BI desktop.":::
 
+> [!NOTE]
+> When categorizing geographic fields in Power BI, ensure to enter **State** and **County** data separately for accurate geocoding. Incorrect categorization, such as entering both **State** and **County** data into either category, may work currently but could lead to issues in the future.
+>
+> For instance:
+> - Correct Usage: State = GA, County = Decatur County
+> - Incorrect Usage: State = Decatur County, GA or County = Decatur County, GA
+
 ## Next steps
 
 Learn more about the Azure Maps Power BI visual: