Hmm, interesting. I don’t know about Mbin, but on Lemmy this sort of thing could be caused if you were on an instance where nobody has subscribed to that community yet. But your instance also has problems with [email protected], [email protected], and [email protected]. And even [email protected] is failing to federate comments. It could be a problem with how Mbin works, or simply caused by nobody on your instance subscribing to those communities. Not sure.