When you saw that message, the Bungie name had already been set, it got set the moment you logged in. As your Steam name used unsupported characters, it became set to Guardian0190.
Changing your Steam name after this, even to something valid, won't change your Bungie name. Bungie name changes will become available sometime in the future.
English
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That's kinda bs, I feel like it shouldn't be automatically set, only once you confirm it or something. Is there really no way for now?
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Unfortunately there is currently no way for now.
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Yes, there's no way for now. You'll need to wait until Bungie gives players the option to change their Bungie Name.