diff --git a/MongodbConnectionFactory.php b/MongodbConnectionFactory.php
index a5148f1..05fdd89 100644
--- a/MongodbConnectionFactory.php
+++ b/MongodbConnectionFactory.php
@@ -27,7 +27,7 @@ class MongodbConnectionFactory implements ConnectionFactory
      *
      * or
      *
-     * mongodb://127.0.0.1:27017/dbname?polling_interval=1000&enqueue_collection=enqueue
+     * mongodb://127.0.0.1:27017/defaultauthdb?polling_interval=1000&enqueue_database=enqueue&enqueue_collection=enqueue
      *
      * @param array|string|null $config
      */
@@ -38,7 +38,10 @@ public function __construct($config = 'mongodb:')
         } elseif (is_string($config)) {
             $config = $this->parseDsn($config);
         } elseif (is_array($config)) {
-            $config = $this->parseDsn(empty($config['dsn']) ? 'mongodb:' : $config['dsn']);
+            $config = array_replace(
+                $config,
+                $this->parseDsn(empty($config['dsn']) ? 'mongodb:' : $config['dsn'])
+            );
         } else {
             throw new \LogicException('The config must be either an array of options, a DSN string or null');
         }
@@ -86,6 +89,8 @@ public static function parseDsn(string $dsn): array
             ];
         }
         $config['dsn'] = $dsn;
+        // FIXME this is NOT a dbname but rather authdb. But removing this would be a BC break.
+        // see: https://github.com/php-enqueue/enqueue-dev/issues/1027
         if (isset($parsedUrl['path']) && '/' !== $parsedUrl['path']) {
             $pathParts = explode('/', $parsedUrl['path']);
             //DB name
@@ -103,6 +108,9 @@ public static function parseDsn(string $dsn): array
             if (!empty($queryParts['enqueue_collection'])) {
                 $config['collection_name'] = $queryParts['enqueue_collection'];
             }
+            if (!empty($queryParts['enqueue_database'])) {
+                $config['dbname'] = $queryParts['enqueue_database'];
+            }
         }
 
         return $config;
diff --git a/MongodbProducer.php b/MongodbProducer.php
index d27f014..12956f7 100644
--- a/MongodbProducer.php
+++ b/MongodbProducer.php
@@ -110,7 +110,7 @@ public function send(Destination $destination, Message $message): void
             $collection = $this->context->getCollection();
             $collection->insertOne($mongoMessage);
         } catch (\Exception $e) {
-            throw new Exception('The transport has failed to send the message due to some internal error.', null, $e);
+            throw new Exception('The transport has failed to send the message due to some internal error.', $e->getCode(), $e);
         }
     }