Hello!
This error is usually caused by a lack of permissions to access the resource. Here are some possible reasons why you might be seeing this error:
The storage account key you are using to authenticate does not have the necessary permissions to access the container. You can try regenerating the storage account key and updating the connection manager in SSIS to use the new key.
The firewall settings on the storage account are blocking access to the container. You can check the firewall settings on the storage account and ensure that your IP address is whitelisted.
The SAS token you are using to authenticate has expired. You can generate a new SAS token and update the connection manager in SSIS to use the new token.
The container you are trying to access does not exist or has been deleted. You can check that the container exists and that the name is spelled correctly.