For the moment, lemmy.ml is using an explicit allowlist for instances we federate with. If you currently run an instance, and would like to be added to join.lemmy.ml:
It looks like you already have federation enabled, but if you're having troubles you're probably best off going to [the support community for assistance at !lemmy_support@lemmy.ml
Thanks! I’m just missing a bunch of comments (but not posts) from Lemmy.ml. I thought lemmy.ml were running on an allow list? Might be something else thought.