Sword 2 Signup help?

[Shinedown]

I'm trying to sign up for Sword 2, But it's asking for a Gamer ID and a Nickname, And no matter what i try it says I can't use that Gamer ID or Nickname.

What should i use!?

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[oliver255]

What is Sword 2?  I would like some information.  Oh wait!  I have a brain and I can use Google.

[Shinedown]

I tried Google already.