Hey @MojangSupport, I was playing with a friend on a private server, But I could see him in chat. Checked the "Chat Report" tab, and saw he was blocked? I never blocked him, but worse I cannot find anyway to unblock him.

If it's on a private server you're going to need to reach out to the owner for assistance. ^TK

I am the owner, But there's doesn't seem anything wrong on the serverside. I can still see his chat in de serverlogs.