Device discovery only works on primary polling engine on python API call

Hi all,

  I am using the code at orionsdk-python/discover_and_add_interfaces.py at master · solarwinds/orionsdk-python · GitHub 

to discover and add interfaces via python. Everything works well on primary polling engine i.e if I set the npm_server variable to

our primary engine there is no issue during discovery.

swis = SwisClient(npm_server, username, password)

    print("Discover and add interfaces:")

    results = swis.invoke('Orion.NPM.Interfaces', 'DiscoverInterfacesOnNode', 1)

however if I set the npm_server to any additional polling engines, I get the following error:

Discover Interfaces Solarwinds:  switch1.example.com

Traceback (most recent call last):

  File "./solar.py", line 120, in <module>

    example.discoverSolarwindsDevice(npm_server,npm_username,npm_password,ipAddress,nodeName)

  File "/usr/local/bin/class/examplenet.py", line 248, in discoverSolarwindsDevice

    results = swis.invoke('Orion.NPM.Interfaces', 'DiscoverInterfacesOnNode', OrionNodeID)

  File "/usr/local/lib/python3.5/dist-packages/orionsdk/swisclient.py", line 29, in invoke

    "Invoke/{}/{}".format(entity, verb), args).json()

  File "/usr/local/lib/python3.5/dist-packages/orionsdk/swisclient.py", line 59, in _req

    resp.raise_for_status()

  File "/usr/lib/python3/dist-packages/requests/models.py", line 840, in raise_for_status

    raise HTTPError(http_error_msg, response=self)

requests.exceptions.HTTPError: 400 Client Error: Verb Orion.NPM.Interfaces.DiscoverInterfacesOnNode: Cannot find assembly for url: https://polling-engine2.example.com:17778/SolarWinds/InformationService/v3/Json/Invoke/Orion.NPM.Interfaces/DiscoverInterfacesOnNode

I wonder what I am doing wrong here. Is there any other way to assign the discovery/polling to additional engines? Currently I have to discovery via primary engine and then manually assign on the web ui

to additional engines.

thanks a lot for any guidance in advance.