title: Azure AD B2C auth with username and e-mail
body: <p>I'm migrating all my users from a legacy IdP to the Azure AD B2C.
  How can I configure the "Local account" to allow users to login with username OR e-mail?</p>
  
  <p>It seems the Local Account just allows me to configure one of these options but I want to allow users to chose to login with e-mail or username.</p>
  
  <p>Thank you.</p>