Due to current migration from reddit and lots of signups on Lemmy instances, you may get temporary errors when trying to subscribe to their communities.
Lemmy.ml also currently have their homepage down and you get this message trying to visit it:
404: FetchError: invalid json response body at http://lemmy:8536/api/v3/site? reason: Unexpected token 'T', "Timeout oc"... is not valid JSON
So try to subscribe to communities from other instances if you get errors trying to subscribe to theirs, and then try again later.
Just wanted to write this so new users dont get confused by the errors. They are not related to this instance.