Set the user's multi-factor authentication (MFA) method preference.
cognitoidentityprovider_set_user_mfa_preference(SMSMfaSettings,
SoftwareTokenMfaSettings, AccessToken)
The SMS text message multi-factor authentication (MFA) settings.
The time-based one-time password software token MFA settings.
[required] The access token.
svc$set_user_mfa_preference( SMSMfaSettings = list( Enabled = TRUE|FALSE, PreferredMfa = TRUE|FALSE ), SoftwareTokenMfaSettings = list( Enabled = TRUE|FALSE, PreferredMfa = TRUE|FALSE ), AccessToken = "string" )