minor update

provider/register-azure/src/main/java/org/opengroup/osdu/register/provider/azure/subscriber/SubscriptionRepository.java

@@ -126,6 +126,9 @@ public class SubscriptionRepository implements ISubscriptionRepository {
             return input;
         }
         catch(AppException e) {
+            if(e.getError().getCode() == 409) {
+                throw new AppException(409, "Conflict", "A subscriber already exists with the same topic and endpoint combination");
+            }
             try {
                 cosmosStore.deleteItem(dpsHeaders.getPartitionId(), azureBootstrapConfig.getCosmosDBName(), cosmosContainerConfig.getSubscriptionContainerName(), input.getId(), dpsHeaders.getPartitionId());
             }