Hi Jonas,
That’s weird. By looking at the log we can see that you get the request with the correct reply-to address. Do I assume correctly that the return object is not an enum but a rich object based message? If it would be an enum you would have to enable the callback support on the replier side as well
endpointConfiguration.EnableCallbacks(makesRequests: false);
I tried to repro your case by slightly modifying the sample Callback Usage • Callbacks Samples • Particular Docs to just send object callbacks and not use the EnableCallbacks call on the receiver side. It seems to work fine.
Here is the repro I used Dropbox - File Deleted
Are your response messages properly marked as messages by either implementing IMessage or match the message convention?
Would it be possible to send us a minimal repro so that we can have a look at it to support at particular dot net?
Thanks
Daniel