MSDN. Create an account. Where can I find my Benefit Access Number, Subscriber ID, or MPN Technical Contact ID?

Question

Microsoft

We need licensed images of MS distributions. I go to MSDN, it requires an account.
I start to register , it asks for some "Benefit Access Number, Subscriber ID, or MPN Technical Contact ID". Where can I get them and do I have it?
There is only an account on Live ID. The Internet suggested that Subscriber ID is a Unique Identifier, which you can see here . But something doesn't fit. MSDN answers:
Whoops! Unrecognized Subscription Data Entered
We're sorry, but the data you entered could not be located in our system.
There are few common reasons for this error.
Where can I find my Benefit Access Number, Subscriber ID, or MPN Technical Contact ID?

Answer 1

I don't know what exactly you are "starting to complain about", but MSDN subscriptions are not free. Apparently after the purchase you would have received what you need.