I’m having the same problem. There was a bug for this (which was closed) github.com/LemmyNet/lemmy/issues/4341
It may have been re-opened, but I haven’t been able to find it after a quick search.
I did try that (following the community), but the mastodon account has been stuck in “awaiting approval” status. I run the Lemmy community that I’m trying to follow with my Mastodon account, but I don’t see how or where to approve these follow requests.
Are those requests gated by the mastodon admin perhaps?
sundray@lemmus.org 2 days ago
irelephant@lemmy.dbzer0.com 2 days ago
Sometimes Lemmy doesn’t send a response saying that the follow worked
neuracnu@lemmy.blahaj.zone 2 days ago
If the mastodon instance never receives acknowledgement that the follow-request was approved, it’s probably not going to start fetching those messages. I’ve tried un-following and re-following; it still doesn’t work.
As I said intially, I think that qualifies the integration as only kinda-sorta working.