Im a bit confused. In a post (made on lemmy.ml) I replied to a comment (from someone on fmhy.ml) and my comment is not showing on sh.itjust.works. I am registered on lemmy.world As far as I understand these instances are connected. Is it taking a long time to aggregate ? Does it have anything to do with language selection? I have undetermined,greek and english selected. Here is the post but it is in greek so it may be a bit confusing.
At least one person has to subscribe to that community from the instance that you want synced, then it starts federating. Unfortunately, it does not update comments/posts that have been made before this first subscription happened. What you can do is manually trigger a sync - to do this, you need to copy the link of the posts/comments and post them in the search bar of the instance you want to have synced.
However, this does not work for replies of comments (because the link is for the thread).I hope this could help you.At least one person has to subscribe to that instance from the instance that you want synced, then it starts federating.
Im not sure I understand, are you saying the problem is that no person from sh.itjust.works is subscribed to lemmy.ml/c/Greece so there is no federation between them ? Or just in general from sh.itjust.works to lemmy.ml ? This seems unlikely since they are relatively large. Here is the post from sh.itjust.works instance I am not sure this tracks. I might have missed something.