At the bottom of the email it says you will get an email from the Orange Bowl app next week to promt you to set up an account. I think the email from UT even said something about using your UT account user name and then hitting "Forgot Password" to set your password on the new Orange Bowl account.
The great thing about the $103 tickets on AllVols was they didn't have the crappy $30 Ticketmaster fees on each one. I assume that is part of why they are using the Orange Bowl app instead of having tickets sent via Ticketmaster. I hope this investigation started by the Taylor Swift fiasco puts Ticketmaster in line somewhat. They have really gotten out of control. Last year's MCB ticket situation was horrible.