Cannot Act As student in Test Environment

[ACook-RVCC]

I'm a Canvas admin, and am trying out the Evaluation portfolio in the Test environment. I created my sample portfolio, but when I try to use the Act As feature to see what it looks like from the students' perspective, no evaluation portfolios are showing up for the students in the class I attached the portfolio to. It's the same result no matter which placement I am using (Global navigation menu, Course navigation menu, or User Account). Is this because the Test environment does not allow fully featured masquerading? Or is it a specific issue with the Portfolios?

Thanks!