I don't see any errors. Larger instances like the one you're on get a LOT of requests, so they instead add them to a queue to be processed when they're able instead of trying to churn through all of them at once. Perhaps lemm.ml is getting a lot of traffic right now, so my little instance is struggling to get federated.
It could just be a time thing. I just made this post to !croak a few minutes ago. Did that federate to lemmy.ml? It's been a few hours since the original post
I'm sorry for not responding sooner! For future reference, you can always @ me for things like this so I see them sooner :)