> Is this bug report related to this issue?
I think it might be, that's what I'm hoping to test. NodeBB upstream has a fix for this; once they make a new release, we'll give it a shot.
I suspect the fix will be: once we pull in this change, we'll be able to rescind the pending follow and resend it.
> Also, you say that federation with https://socialhub.activitypub.rocks/ (also a Discourse) works. Which We Distribute category is federating with which SocialHub category?
Just checked this, we're following their ActivityPub category specifically. For some reason, their Actor shows up as https://socialhub.activitypub.rocks/ap/actor/e9a2dbe246a6064329b37247d620bab1