ERROR 000732: Input Raster: Dataset .../Viewshe_ImageSe1.tif does not exist or is not supported. Viewshed on ArcGIS server

[NicolasRojas]

Hello, 
I wrote my own geoprocessing tool that performs Viewshed analysis. The tool works perfectly fine in the Pro environnment but once it's published (no errors when publishing from Pro 3.2.2), the raster output from arcpy.ddd.Viewshed2() returns the error 000732. No file is written.

I've tried using a scratch name for the result. I've tried using 'in-memory/raster_name'. I've tried without specifying a name in the viewshed tool when setting the workspace to the scratchGDB. I've written to os.path.join(arcpy.env.scratchGDB, 'raster_name') with no success. I've attempted to save the result as such 

arcpy.sa.Raster(arcpy.ddd.Viewshed2(in_raster=image_service_raster, in_observer_features=observer_feature_layer)). Raster not found in every case.

Here are my questions: Does the server need to have a specific running service (maybe utilitary) in order to handle the output? Is there a rule about using Viewshed outside of pro? Why doesn't the result write on disk?
I don't want to use the ready to use tools 'create viewshed' as I can't use my own raster image as input.

Thanks in advance.

[NicolasRojas]

Here is some of the code I'm using:

        # Set workspace
        arcpy.AddMessage(arcpy.env.scratchFolder)
        arcpy.env.workspace = arcpy.env.scratchGDB
        arcpy.AddMessage(arcpy.env.workspace)

        # Env params
        arcpy.env.overwriteOutput = True

        # Raster URL
        image_service_url = parameters[0].valueAsText

        # Observer FC
        observer_feature_layer = self.create_observer_fc(parameters[2].valueAsText)
        arcpy.AddMessage(observer_feature_layer)
        if parameters[1].valueAsText is not None: # view_extent
            try:
                arcpy.env.extent = parameters[1].valueAsText
            except Exception as e:
                arcpy.AddMessage(f'Extent was unable to be set. Making 1km buffer around point (dev)\n{e}')
                arcpy.env.extent = self.create_extent_from_point(observer_feature_layer)

        # Check creations
        arcpy.AddMessage(arcpy.ListRasters()) # empty
        arcpy.AddMessage(arcpy.ListFeatureClasses()) # ['ObserverFeatureClass']

        # Viewshed
        arcpy.AddMessage(f"Starting Viewshed2 operation...")
        viewshed_raster = arcpy.ddd.Viewshed2(in_raster=image_service_url, in_observer_features=observer_feature_layer, out_raster=os.path.join(arcpy.env.workspace, 'Viewshed_Image'))
        arcpy.AddMessage(f"Viewshed2 completed. Output raster path: {viewshed_raster}")
        saved_viewshed_raster = arcpy.ListRasters()[-1] # Fails here!

        # Check creation 2
        arcpy.AddMessage(arcpy.ListRasters()) # should be ['Viewshed_Image'] but is empty

        # Raster to polygon... fails since Viewshed not found
        arcpy.management.CreateFeatureclass(arcpy.env.workspace, 'ViewshedFeatureClass', 'POLYGON', spatial_reference = arcpy.SpatialReference(3857))
        viewshed_poly_path = os.path.join(arcpy.env.workspace, 'ViewshedFeatureClass')
        arcpy.conversion.RasterToPolygon(saved_viewshed_raster, viewshed_poly_path, 'NO_SIMPLIFY')