Start arma3
go to configure-> profile
select edit and copy your UID
Save it somewhere for later
start dedicated server
join and log in as admin
//------test #kick
execute admin command
#kick <yourUID> //no effect
#kick <yourname> //it works!
rejoin as admin
#userlist //get your player # from there
#kick <yourplayer#> //it works!!
//------test #exec ban
execute admin command
#exec ban <yourUID> //no effect
#exec ban <yourname> //no effect
#userlist //get your player # from there
#exec ban <yourplayer#> //it works!!
Now go to arma 3 main directory and delete ban.txt