Help Problem joining ★OaO★ server

[xsadcs]

When i try to join "★OaO★ Dust2 Only" or "★OaO★ Dust2" it says to change my name but when i try to join "★OaO★ Classic" or any other ★OaO★ server i join normaly. Someone has a solution?

 

[MAMAC]

what is your name ?

 

[xsadcs]

what is your name ?

It's "Sniper123"

 

[MAMAC]

Try another name

 

[xsadcs]

Try another name

i tried changing it 3 times all different and still get the message "Please change your name."