diff --git a/src/Drivers/index.ts b/src/Drivers/index.ts
index ca27809..7e71028 100644
--- a/src/Drivers/index.ts
+++ b/src/Drivers/index.ts
@@ -117,9 +117,12 @@ export class AzureStorageDriver implements AzureStorageDriverContract {
     options.expiresOn = options.expiresOn || new Date(options.startsOn.valueOf() + 3600 * 1000)
 
     const factories = (blockBlobClient as any).pipeline.factories
-    const credential = factories[factories.length - 1] as StorageSharedKeyCredential
+    let credential = factories[factories.length - 1] as StorageSharedKeyCredential
+    if (!credential) {
+      credential = blockBlobClient.credential as StorageSharedKeyCredential
+    }
 
-    const blobSAS = await generateBlobSASQueryParameters(
+    const blobSAS = generateBlobSASQueryParameters(
       {
         containerName: blockBlobClient.containerName, // Required
         blobName: blockBlobClient.name, // Required