Getting ERROR 999999 when trying to use arcpy.UploadServiceDefinition_server()?

Here is my code

def upload(name, client, working_dir): arcpy.env.overwriteOutput = True arcpy.SignInToPortal('https://www.arcgis.com', username, password) outdir = working_dir + "\\PROJECTS\\" + name + "\\sd\\" aprx = arcpy.mp.ArcGISProject(working_dir + "\\PROJECTS\\data_holder\\data_holder.aprx") m = aprx.listMaps()[0] print("Uploading data for " + name) lyrs = m.listLayers() arcpy.mp.CreateWebLayerSDDraft(lyrs, outdir + name + ".sddraft", name, "MY_HOSTED_SERVICES", "FEATURE_ACCESS", name, True, True, False, False, False, name, name, name, None, None ) arcpy.StageService_server(outdir + name + ".sddraft", outdir + name + ".sd", 102) arcpy.UploadServiceDefinition_server(outdir + name + ".sd", 'My Hosted Services') 

This is the error I am getting. I have tried multiple different ways to put in parameters.

Uploading data for test_project

Traceback (most recent call last):

File "main.py", line 304, in module

upload(name, client, working_dir)

File "main.py", line 242, in upload

arcpy.UploadServiceDefinition_server(outdir + name + ".sd", 'My Hosted Services')

File "C:\Program Files\ArcGIS\Pro\Resources\ArcPy\arcpy\server.py", line 954, in UploadServiceDefinition raise e

File "C:\Program Files\ArcGIS\Pro\Resources\ArcPy\arcpy\server.py", line 951, in UploadServiceDefinition retval = convertArcObjectToPythonObject(gp.UploadServiceDefinition_server(*gp_fixargs((in_sd_file, in_server, in_service_name, in_cluster, in_folder_type, in_folder, in_startupType, in_override, in_my_contents, in_public, in_organization, in_groups), True)))

File "C:\Program Files\ArcGIS\Pro\Resources\ArcPy\arcpy\geoprocessing_base.py", line 506, in return lambda *args: val(*gp_fixargs(args, True))

arcgisscripting.ExecuteError: ERROR 999999: Error executing function.

ERROR: code:400, Invalid URL, Invalid URL, Bad syntax in request.

Failed to execute (UploadServiceDefinition).