If you submit an Adaptive Form and receive the following message in the browser from the Publish instance:
It means that the Author instance cannot be reached by the Publish instance to be able to process the data.
The AEM DS Settings need to be set on the Publish instance. This service configuration determines which author instance (or cluster) receives submitted data from forms destined for processing on an Author instance.
The same error can appear if the author instance cannot be reached. This means that your architecture team should understand that for a successful forms deployment, the Author instance is just as important as the Publish instance supporting it.
{"unresolvedMessage":"Can't find resource for bundle java.util.PropertyResourceBundle, key Connect to localhost:4502 [localhost/127.0.0.1, localhost/0:0:0:0:0:0:0:1] failed: Connection refused (Connection refused)","messageArgs":[],"code":"AEM-FD-011-004"}