Azure partner resource tagging via User-Agent header
When tagging resources for attribution during deployment, there isn't anything visible on the resource itself that indicates the association, it's an internal implementation.
If your goal is to verify that the code you've written is working correctly (such that the resource will be properly attributed) there's currently no way to do this externally for the UserAgent method - we can only do it internally. You can verify for a template deployment using the script in the doc you linked to, but that will only work for template deployments not, API calls (TF, SDK, etc).
You won't see anything in the Partner Portal unless 1) the GUID is registered and 2) there is billable usage for the resource.
All that said - I did a quick peek in the logs and I do see some resources provisioned with 3fd1a53d-3ef0-4111-8a66-211ed6470935 in the userAgent.
That help?