When I create a new Virtual Machine in Azure, I cannot select my second subscription. They are both visible on my account, except on the drop-down list when creating Virtual Machines.
I have two subscriptions in my Windows Azure account. The first one is a 3-month trial. Then I opened a Bizspark account. Since the Virtual Machine feature is in preview, the technical support closed my ticket and asked me to refer to forums, which I couldn't find anywhere on the Azure account page.