Do you have another application that reads from the Event Hub using EventProcessorHost? EventProcessorHost sets an epoch on the receiver to ensure that only one active reader for a given consumer group and an event hub partition is active. You can try it with a different consumer group. Other scenario where this could happen is if you turn on checkpointing on EventProcessorHost. Here is some guidelines from MS how to use the Epoch settings for asynch receivers: https://blogs.msdn.microsoft.com/gyan/2014/09/02/event-hubs-receiver-epoch/ ... View more