username = "<your user name>"
password = "<your password>"
cf_service = "https://www.arcgis.com".format(username, password)


#Add the geoprocessing service as a toolbox. Use an alias when importing
arcpy.ImportToolbox(cf_service, "agol")

#Set the variables to call the tool
facilities = r"C:/data/Inputs.gdb/Stores"
incidents = r"C:/data/Inputs.gdb/Customers"
output_routes = "C:/data/Results.gdb/Routes"
output_directions = "C:/data/output/Results.gdb/Directions"

#Call the tool
result = arcpy.agol.FindClosestFacilities(incidents, facilities, "Minutes", "", 2)