RabbitMQ dead letter exchange - route by "x-death.reason" or "x-first-death-reason" header

I am trying to set up RabbitMQ to route messages through a Dead Letter Exchange based on the death reason (either "x-death.reason" or "x-first-death-reason" would do).

My understanding is that when a message dies that "x-death.reason" and "x-first-death-reason" are set as headers when the messages is sent to the DLX. So my reasoning is that I should be able to set up an exchange with type=headers to be able to route by the value of these headers.

Unfortunately, I just can't get it to work.

The DLX is set up like

However each dead message gets routed to all of the bound queues.

i.e. the filtering/routing is not working.

Can someone please let me know how to configure this correctly.

Thanks

From: https://www.rabbitmq.com/tutorials/amqp-concepts.html#exchange-headers

Note that headers beginning with the string x- will not be used to evaluate matches.