MCPE-8128Usernames starts with "/" used as command
And you get "Command Not Found" when player enters or leaves a game.
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Added Assignee: 
[Mojang] Shoghi Cervantes
Resolution: Unresolved → Fixed
Added affects versions: 0.11.0
Added duplicates link: MCPE-7965Space is replaced with "game_difficulty" text in username barFixed
Hi Mustafa, I cannot reproduce this issue on a Samsung Galaxy S4 Android 4.4.2 running MCPE 0.10.5. When I change the player name to "/Steve" and open a local world, I do not receive an error. Can you please provide more details of what you did to get this error message so I can reproduce the error in my game?
Player with name with / doesnt gets this. Other players in server gets. Not happens in local games.
Added screenshot.
I can't confirm because I only have 1 MCPE license (and thus can't test multiplayer bugs) but the screenshot makes this seem credible and we have previously identified unescaped character issues with the world name in Android.
I cannot even type a / in the username slot
This has been fixed, on the new version player names are limited to letters, numbers and underscore