We’ve been pretty heads down on launching autograding and haven’t been paying enough attention to issues like this. We’re sorry we left you without support.
Can you please try signing out of Classroom Assistant and signing back in? I notice your logged in user in Assistant is different than the one in Classroom.
Moving forwards, the best place for support for GitHub Classroom will be support. Would you mind reaching out at https://support.github.com/contact if you continue to have issues?