Same problem also in 10.3.1.
Ok for Symbology but "has Labels" property in Map Service Layer i set to False (but visible in MXD).
Thanks for any suggest...
Same problem here. Is there still no solution?
Anybody has an idea how to include labels in the result map of a geoprocessing service?
In my case the problem could be solved as follows:
The uploaded python script contained «MakeQueryLayer_management» (https://pro.arcgis.com/de/pro-app/tool-reference/data-management/make-query-layer.htm).
In order to display labels on the resulting mapservice, the "QueryLayer" had to be saved as a feature class first («FeatureClassToFeatureClass_conversion»; http://desktop.arcgis.com/de/arcmap/10.3/tools/conversion-toolbox/feature-class-to-feature-class.htm).