Yes, the direct link works.
But my suggestion is to be able to FIND this link on the Prezi website. (I still haven’t found it on the Prezi website - which means, even if it does currently exist on the Prezi website it is too hard to find.)
I originally suggested the ‘support and license’ page as that is where you find your support dashboard on this ‘get satisfaction’ website.
But it could be easily attached to the Prezi support page.
(For example - on the support page. Instead of having a request box automatically open when choosing Premium Support - have the Premium Support link GO TO the log-in for the zen desk where you can then EITHER submit a request OR check the status of a request. The first option - only gives you one option i.e. submitting a request. Whereas the second option gives you two choices: submit a request and/or review request.)