How to Backup to Azure Storage? A day before I tried to back up our ddbb log file to azure storage. So, the transact is simple

backup [log|database] &lt;name&gt;
To URL = &lt;Azure_Storage_url&gt;


Credentials are defined apart, 

CREATE MASTER KEY ENCRYPTION BY PASSWORD = &lt;Key&gt;

CREATE CREDENTIAL &lt;name_credentials&gt;
WITH IDENTITY = 'SHARED ACCESS SIGNATURE'
    ,SECRET   = &lt;SAS_Token&gt;
go  


I got the error below:

Msg 3201, Level 16, State 1, Line 34
Cannot open backup device &lt;Azure_Storage_url&gt;. Operating system error 50(The request is not supported.).


I tested that credentials with a bulk insert on the same container I was pointing with  it works fine. 

The SAS token was generated with full permissions



No policy were made on the container since I understood (Is my fault here?) that SAS token already had full access. 

How can I do a successful backup from scratch?

Thanks!
No policy were made on the container since I understood (Is my fault here?) that SAS token already had full access. 


Backup to URL requires a SAS Token generated from a Container Access Policy with fixed start and Expiration Dates.  An Storage Account-scoped SAS token will not work.