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You can select only email and phone number without username, but you will have to pick either email or phone number at sign-up as the user identifier. See the Cognito user pool sign-in options information, "If you select only phone number and email, your user will be prompted to select one of the two sign-in options when they sign up". So if you pick email at sign-up, then you can't use phone number to sign in.
已回答 2 年前
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