Hi!

I'm trying to find out how a player was able to teleport to sleepers even without the permission. Any idea on how this could have happened?

can you elaborate some more?

the player teleported to some random player, or a friend?

what command did he use?

which permission are you referring to?

The player was able to use the /tp command even without the permission being added.

he has the nteleportation.tp permission if he can use /tp command