Hey there. Name changes will be made available at a later date.
You received a default name because your in-game name has to follow various rules, one is that it can't contain certain special characters. When you first log in, yout Bungie name becomes the platform name of the account you're using, and It looks like your Steam platform name is all special characters so you got given a default name.
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will be waiting when it will be possible to cancel? how long?
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This winter is what they have stated so from now until mid March.