Remote Moderator actions still do not seem to work after upgrading to 0.18.5

I was made moderator of the /c/TrueAnon on the lemmy.ml instance a while ago, and none of my actions have ever federated to lemmy.ml, so I gave up. Thought I'd try again after this upgrade and still no dice. The response I'm getting back from the API when I try to add my lemmy.ml account to moderator status is "not_a_moderator." Is this a transient federation issue or are there more fixes required for this scenario to work correctly?