diff --git a/Datastore/src/DatastoreClient.php b/Datastore/src/DatastoreClient.php
index 7296e17b6bed..6498deb496d1 100644
--- a/Datastore/src/DatastoreClient.php
+++ b/Datastore/src/DatastoreClient.php
@@ -182,6 +182,11 @@ public function __construct(array $config = [])
             ],
         ];
         $config = $this->buildClientOptions($config);
+        $config['credentials'] = $this->createCredentialsWrapper(
+            $config['credentials'],
+            $config['credentialsConfig'],
+            $config['universeDomain'],
+        );
 
         $config = $this->configureAuthentication($config);
         $this->connection = $connectionType === 'grpc'