To unban someone in a JJS private server, the usual fix is to leave and rejoin or restart the server/session, because the ban is often only temporary for that room/session rather than a permanent account ban.

What to try

  • Close the private server/session completely.
  • Reopen it or start a fresh session.
  • Invite the person again after the restart.

Why this works

A discussion thread says the ban is only for the current session, and restarting creates a new room session so the player can join again.

Important note

If the person is still blocked after restarting, it may be a different kind of restriction or a game-specific moderation issue, not just a private-server ban.

In short: there usually isn’t a separate unban button; restarting the private server/session is the common workaround.

TL;DR: restart the JJS private server/session, then reinvite them.