restore database to azure blob failed

Hi experts,

  I create a test db in SQL on Azure VM and backup to my storage account successfully. However, when I delete the database and restore using the T-SQL below, it failed. Please help.

--- query ---

USE [master]
RESTORE DATABASE [test] FROM  
URL = N'https://sa1qcisapdr.blob.core.windows.net/tcd-sql2014/test_backup_2014_08_18_013128.bak' 
WITH  CREDENTIAL = N'AzureCredential' ,  FILE = 1,  
MOVE N'test' TO N'https://sa1qcisapdr.blob.core.windows.net/tcd-sql2014//test.mdf',  
MOVE N'test_log' TO N'https://sa1qcisapdr.blob.core.windows.net/tcd-sql2014//test_log.ldf',  NOUNLOAD,  STATS = 5

GO

--- result ---

Msg 3634, Level 16, State 1, Line 2
The operating system returned the error '50(The request is not supported.)' while attempting 'RestoreContainer::ValidateTargetForCreation' on 'https://sa1qcisapdr.blob.core.windows.net/tcd-sql2014//test.mdf'.
Msg 3156, Level 16, State 8, Line 2
File 'test' cannot be restored to 'https://sa1qcisapdr.blob.core.windows.net/tcd-sql2014//test.mdf'. Use WITH MOVE to identify a valid location for the file.
Msg 3634, Level 16, State 1, Line 2
The operating system returned the error '50(The request is not supported.)' while attempting 'RestoreContainer::ValidateTargetForCreation' on 'https://sa1qcisapdr.blob.core.windows.net/tcd-sql2014//test_log.ldf'.
Msg 3156, Level 16, State 8, Line 2
File 'test_log' cannot be restored to 'https://sa1qcisapdr.blob.core.windows.net/tcd-sql2014//test_log.ldf'. Use WITH MOVE to identify a valid location for the file.
Msg 3119, Level 16, State 1, Line 2
Problems were identified while planning for the RESTORE statement. Previous messages provide details.
Msg 3013, Level 16, State 1, Line 2
RESTORE DATABASE is terminating abnormally.