I noticed that federation was broken on fedibb.ml, because Activitypub requests were not properly forwarded to the Lemmy backend. This fixes the problem so it is strongly encouraged to upgrade. It also includes many other bug fixes, see the commit log for details.
To upgrade, go into your Lemmybb installation folder and run docker-compose pull && docker-compose up -d
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I still can’t post to your demo. Is it not open? Like view only?