Team

how to unlock a team?

I also had a problem in which my team was permanently closed, however, I as the team leader did not close this team.

Closed teams cannot be reopened, they are closed "forever", as it says in the closing confirmation prompt.

Sorry, be more careful next time (This includes reading all prompts and only giving admin role to people you trust).

But it wasn’t me as a leader who requested the closure, the team was closed automatically so there was no prompt confirmation.

So some other admin in your team closed it. You should choose better admins. A team is like a house, be super careful when choosing who you give the keys to.

I think you did not understand, I am the only administrator of the team, the problem here is the lichess server who is presenting more problems every day. It's getting more complicated every day.