What do you mean federation was taken down for Lemmy? I haven't noticed that.
EDIT:
Also wanted to point out that you can sub and communicate and create posts on beehaw.org posts from your lemmy.ml or lemmy.ca accounts. It is clunky, but you just have to go to search page (top right) from your account's home instance, change the type from 'All' to 'Community' and search for the remote community using their format for searching communities (i.e.: !technology). The search usually returns nothing on the first search if your instance updates it's federated info with the remote instance or there are network errors. So just clear the search and try 'technology' and I have found that returns it.
KBins search function is a lot better. I have found a lot of other bugs on Lemmy, but you can work around them.
You can also sub to those lemmy communities from here. but that is a bit more in development than the lemmy to lemmy instance communication.