Hi @marc ,
Thank you very much for the great explanation 
!
I have below questions after going through the information:
- Fan out with multiple durable subscriptions does not work without having the ‘Queues’ (in the middle) subscribe to the topic. Correct?
- Both durable and non-durable subscriptions does not show the same behavior. In case of non-durable subscriptions, all subscribers are able to receive all messages. However, in case of durable subscription, subscribers are receiving only sub set of messages in a round robin fashion as mentioned. May I know what is the reasoning behind treating these two subscription models differently?
Thanks,
Raghu