#Error 022-2571: ID is already in use
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022-2571 (3DS/2DS)
Support code detected, press to expand information
"choose a different username" but I can't, I just registered my account
If your NNID is called the same and configured on your 3DS as well it doesnt work, since the 3DS thinks it's already used on the same device. See error description: "...or is used by a different NNID on your console."