Producing messages directly to retry topics?

[mdk8414]

I have a use-case where I would like to use my consumer's retry topic to reprocess messages sent to our dead letter topic. I built a service that pulls messages from the DLT and publishes messages directly to the retry topic, but my consumer is not picking up these messages. If I send messages to the original topic and let them retry naturally, it works just fine. It's only an issue if I push directly to the retry topic.

What are the requirements for the consumer to pick up messages from the retry topic? I was thinking that it would pick up anything sent to the retry topic but that doesn't seem to be the case. I've tried sending a dozen headers as well, but nothing has worked so far.

What is the bare minimum that needs to be sent (headers, etc.)?