Azure B2C：如何使用 MFA 的 OtherMails 属性

Question

我正在使用 B2C 自定义策略，它允许使用用户名而不是传统的 email 进行注册/登录。

作为注册过程的一部分，我将 Email 保存在 otherMails 属性中。

when choosing MFA as Email, I don't see the email field prepopulated with the email that I have on user record.

otherMails 属性可以用于 MFA email 吗？

<ClaimsTransformation Id="CreateEmailsFromOtherMailsAndSignInNamesInfo" TransformationMethod="AddItemToStringCollection">
    <InputClaims>
            <InputClaim ClaimTypeReferenceId="otherMails" TransformationClaimType="collection" />
    </InputClaims>

<TechnicalProfile Id="AAD-UserWriteUsingLogonName">
    <PersistedClaims>
        <PersistedClaim ClaimTypeReferenceId="otherMails" />
    </PersistedClaims>
    <OutputClaims>
        <OutputClaim ClaimTypeReferenceId="otherMails" /> 
    </OutputClaims>

<TechnicalProfile Id="LocalAccountSignUpWithLogonName">
    <OutputClaims>
        <OutputClaim ClaimTypeReferenceId="otherMails" /> 
    </OutputClaims>
<TechnicalProfile Id="LocalAccountDiscoveryUsingUserNameAndValidateStrongAuthenticationEmailAddress">
    <OutputClaims>
        <OutputClaim ClaimTypeReferenceId="otherMails" /> 
    </OutputClaims>
<TechnicalProfile Id="AAD-ReadCommon">
    <OutputClaims>
        <OutputClaim ClaimTypeReferenceId="otherMails" />
    </OutputClaims>

<RelyingParty>
    <OutputClaim ClaimTypeReferenceId="otherMails" PartnerClaimType="emails" />
</RelyingParty>

Answer 1

用于 MFA 的字段是“strongAuthenticationEmailAddress”。

这是后端使用的，所以我怀疑它是否可以更改。