@kayser ...

Have you spoken with your school's Canvas administrator(s) to see if they have made New Quizzes available for you and your fellow instructors?  This is where I would start.  I believe that instructors can turn it off completely, turn it on for everyone, or they can even set it so that it's off in every course but instructors would have to turn it on per course,  Your Canvas admin team should be able to tell you what their current plan is for New Quizzes.  Hopefully you'll be able to connect with them soon.  Good luck!