That did it. I think I broke it by foolishly trying to migrate the settings from the other slack plugin.
One thing I don’t understand is who can use the slack App I created. It is just me? If so, that’s a little sucky. If not, wait, anyone can control what categories get watched? I see “collaborators” in the slack API page. If I add a collaborator can they too control the rules?
Also, it seems that rules established in the Discourse web interface don’t show up in slack if you do a /discourse status. Is that right?