A SIBUS enabled WSN-Notification service is created in WebSphere Application Server v8.5.5.x but no outbound notifications are seen.The SystemOut.log has the following error:

CWSJN1004E:An attempt was made to perform a notify operation using WSN Service xxxService on topic xxx:sub but the broker is configured to require notification registration and no registration has been received for this topic.The producer's endpoint reference was Address[[http://ipaddress:80/xxxservice/Service]], ReferenceParams[].The IP address of the client was 

How can this error be fixed?