The Google Cloud Storage documentation states :
If you want the test.example.com to serve the same content as is served from www.example.com, add a CNAME record that aliases "test" to "www". A separate bucket is not needed in this scenario. https://cloud.google.com/storage/docs/website-configuration?hl=en
With the alias CNAME in place (on Google Cloud DNS) the following error is being thrown by the Cloud Storage :
<Error>
<Code>NoSuchBucket</Code>
<Message>The specified bucket does not exist.</Message>
</Error>
Has this behavior changed and the documentation hasn't been updated ? Or are there any additional steps required to make this work ?