Update sql-server-backup-to-url-best-practices-and-troubleshooting.md

ICM https://portal.microsofticm.com/imp/v3/incidents/incident/424962517/summary

Update docs/relational-databases/backup-restore/sql-server-backup-to-url-best-practices-and-troubleshooting.md

Co-authored-by: Pam Lahoud <32913866+bluefooted@users.noreply.github.com>

Update docs/relational-databases/backup-restore/sql-server-backup-to-url-best-practices-and-troubleshooting.md

Author: ujpat

docs/relational-databases/backup-restore/sql-server-backup-to-url-best-practices-and-troubleshooting.md

@@ -214,6 +214,10 @@ To resolve this issue, create a configuration file that allows the Backup to URL
 
 1. Place the configuration file in the Binn folder of the [!INCLUDE [ssNoVersion](../../includes/ssnoversion-md.md)] Instance. For example, if my [!INCLUDE [ssNoVersion](../../includes/ssnoversion-md.md)] is installed on the C drive of the machine, place the configuration file in `C:\Program Files\Microsoft SQL Server\MSSQL13.\<InstanceName>\MSSQL\Binn`.
 
+1. `BackuptoURL.exe` isn't called when using [SAS keys](/azure/storage/blobs/storage-blob-user-delegation-sas-create-powershell), but is triggered when using an [access key](/azure/storage/common/storage-account-keys-manage?tabs=azure-portal). Make sure you use access keys, or you may receive the following error:
+
+> Operating system error 50(The request is not supported.)
+   
 ## Common errors and solutions
 
 | Issue | Solution |