passing object in rpyc fails

I am trying to pass an object as a paramater using RPyC from the client to the server. But the server is unable to access the object and I receive an AttributeError.

Server Code:

class AgentService(rpyc.Service):
  def exposed_func(self, obj):
    return obj.name

client code

self._conn = connect(agent_host, agent_port, config = {"allow_public_attrs" : True})
return self._conn.root.func(obj)

returns: AttributeError: cannot access 'name'.

I am using RPyC services and accoding to the website, this should work.

Any ideas?