Also, the user I'm trying to add the article for, User:JRicker,PhD, doesn't have any contribs listed on the dashboard, despite having made edits in recent weeks that ought to be showing up. (Is the comma in his username maybe a problem for replica?)
Okay, that was user error above. I had not clicked "Save" after adding the assignment. It worked for me. The last paragraph is still relevant, however.
Using my admin account, I've tried multiple times to add an assignment to one of the students in this course: http://dashboard.wikiedu.org/courses/Wiki_Ed-APS/Summer_Seminar_in_Psychology_%282015%29/students
It fails every time, although with no errors on Sentry. However, some related actions by that user were resultinging in successful edits: https://en.wikipedia.org/wiki/Special:Contributions/JRicker,PhD
Also, the user I'm trying to add the article for, User:JRicker,PhD, doesn't have any contribs listed on the dashboard, despite having made edits in recent weeks that ought to be showing up. (Is the comma in his username maybe a problem for replica?)