create_block_blob returns ResourceNotFound

I experience a problem when trying to create a block blob with `create_block_blob` with a client using a SAS token to authenticate:

```
client = Azure::Storage::Blob::BlobService.create(
storage_account_name: 'my_account_name',
storage_sas_token: 'sas_token'
)
client.create_block_blob('some_container_name', 'test123.csv', 'some_content')

# Azure::Core::Http::HTTPError: ResourceNotFound (404): The specified resource does not exist.
```

The credentials are valid and I am able to create a block blob using the Azure Storage Explorer.

I don't get the `ResourceNotFound` error - I am just trying to create the blob so of course is does not exist yet - according to the README there is also not something I have to do before (like initializing the blob).
Or am I doing something wrong with authentication by SAS token?

Start with BlobService.create and the create_block_blob entry point, then compare their SAS-token handling with the README example. Reproduce the ResourceNotFound response using the shown container and blob inputs, and determine what needs to change so creating a new block blob succeeds with SAS authentication.

Written by the indexing model from the issue text.