Polygon feature data with a unique value symbology is not showing up on Map Viewer in Portal for ArcGIS 11.1 as a map service.

Additional Information

Workaround

Workaround One:

1. Open the Map Package in ArcGIS Pro 3.1.x.
2. Create a new file geodatabase and add the polygon feature to the file geodatabase (it was exported to a fresh layer by right-clicking 'Data' > 'Export Features').
3. Once in the new file geodatabase, right-click the polygon feature and click 'Add to New' > 'Map'.
4. Once added to the new map, right-click on the feature and click 'Symbology'.
5. Once 'Symbology' is selected, select 'Unique Values' under primary symbology.
   1. For 'Field 1', choose "Suitability_Slope"; try to match the colors for the three symbol classes of 1, 5, and 10.
6. Navigate to 'Share' > 'Web Layer'.
7. Choose 'Map Image' under 'Copy all data' > 'Analyze'.
8. Fix any errors if they pop up and then 'Publish'.
9. Navigate to view the published item in Map Viewer.

Workaround Two:

1. Open the Map Package in ArcGIS Pro 3.1.x.
2. Navigate to 'Share' > 'Web Layer'.
3. Choose 'Map Image' under 'Copy all data' > 'Analyze'.
4. Fix any errors that appear, and then 'Publish'.
5. Change the symbology in Map Viewer itself. The features appear on the map after a while.

Workaround Three:

Publish as a feature. However, this may not be appropriate in workflows where a map service is required.

Steps to Reproduce