Update azure-data-lake-storage-backup-support-matrix.md

Author: Daya-Patil

articles/backup/azure-data-lake-storage-backup-support-matrix.md

@@ -21,6 +21,10 @@ This article summarizes the regional availability, supported scenarios, and limi
 
 Vaulted backups of Azure Data Lake Storage are available in the following regions: France South, India West, West Central US, East Asia, India Central.
 
+>[!Note]
+>- This feature is currently in limited preview and is available in specific regions only. See the [supported regions](azure-data-lake-storage-backup-support-matrix.md#supported-regions).
+>- To enroll in this preview feature, fill [this form](https://forms.office.com/r/sixidTkYb4)  and write to [[email protected]](mailto:[email protected]).
+
 ## Supported storage accounts
 
 The following table lists the supported storage account details: