Classroom: "Review" button leads to 404

I’m using Classroom with my course for the third time this semester. This time, when I click on “review” to view students’ submissions, I get a 404 page - every time, no exception. I am logged in. Has something changed?

link to my review page

I am still able to go to the students’ repos. But I’d like the possibility to give feedback.

I’d appreciate any pointers you may have on this!