Beehaw disabled federation with https://lemmy.world/ and https://sh.itjust.works/ , two of the biggest instances just a few hours ago. Beehaw claims there were a lot of trolls coming from those communities and there is a lack of moderation tools on Lemmy to deal with them. While most of Beehaw's community is okay with this, a lot of people on both sides are upset because it means splitting the community further.
Now Beehaw can't access popular communities and other instances can't access Beehaw communities. You can read the official post about it here: https://beehaw.org/post/567170