Hi there! Looks like you linked to a Lemmy community using an URL instead of its name, which doesn't work well for people on different instances. Try fixing it like this: [email protected]
I'm doing it with Calckey myself, but Communities basically act like users. You can search and follow them. You'll get to see posts in that community in your feed, and you can make top-level comments and reply to direct replies on your own comments, but if you want to see comments that aren't responding to you you'll have to switch over to Lemmy.
I basically just browse my own Calckey front page now and then when I see a Lemmy thread that looks interesting I open it in Lemm.ee or Blahaj.zone.
On Calckey you just search for @NAME@INSTANCE, whether the name is a community or an individual you'll be able to follow them!
Edit: I made a little VIA macro, so now I've got a hotkey that grabs the link in my current clipboard and searches it in lemm.ee. Made it a lot easier!
There is a bug in 2FA in Lemmy. In every implementation of TOTP, the account is not locked under 2FA until the server verifies at least one TOTP password. In Lemmy, if the user is unable to set up 2FA on his device, and quits the session, he is locked out of his account.