This is supposed to work without admin. You can file a support ticket for this.
However, as others have pointed out, the tier1 boxes that are Microsoft managed are going away - SOON. There have been two email notices sent out. By November 1 you can no longer deploy new tier1 VMs, December 1st you will lose RDP access, and in January the box will be removed all together. You will need to plan to move to VMs on your own subscriptions. Details in the emails, including how to receive any Azure credits.