For whatever reason, while checking to see if my links were current earlier today (2022-09-03), this link came up as "Group not found." It has since returned. I'm not sure what occurred. However, I figured that I would write that I experienced this situation in case others had as well.
My money's on some kind of temporary hiccup, like the computers running the website frontend code stopped being able to connect to the database(s) with all the group information in them.