nick not used are invalid
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nick not used are invalid
You mean your character name?
If so, if it's one you used and then tried to re-use within 30 days, it won't work. Warmane recently made it so you have to wait 30 days before re-using the name, even if you deleted the character.
If that's not the case, then it's likely someone else is already using the name, or has tried to within the past 30 days.