Logic app with high availability reading from service bus topic

Question

We have a logic app running in high availability mode reading from a message queue. Having it read from a message queue ensured that only one of the logic app instances could process it. Now we need to change the queue to a topic which, if I understand it correctly, means we lost our ability to ensure that only one instance of the logic app processes the message. So my question is there a way to have a logic app be enabled for high availability, read from a topic, and ensure that only one instance processes a given message as it arrives?

Answer 1

TL/DR: Peek/Lock works the same weather the message arrives via a Topic or directly from a Queue.

Answer 2

You can use the Logic App to process message from a particular Subscription under a Topic.

There is nothing different between listening for messages from a Queue and Topic Subscription. Only one instance processes the message as the message will be locked when it is received, so there can be only one active listener.

Look here for listening messages from Topic Subscriptions.