There have been issues with product keys availability in MSDNAA.  But we have a workaround here locally.

If you would like Windows Vista RTM for your MSDNAA department, please get your MSDNAA administrator to email netoz@microsoft.com with the following information:
- MSDNAA Subscriber ID
- Your MSDNAA Administrator mailing address
- How many machines you intend to install Vista on in your department for and for what purpose (lab installs, install fests, etc)

This is a temporary workaround until we have Windows Vista RTM available on MSDNAA.  Thanks.