I can see that there is a phone only authentication (in public preview ) https://docs.microsoft.com/en-us/azure/active-directory-b2c/identity-provider-local?pivots=b2c-user-flow#phone-or-email-sign-in-preview
Is there a similar flow to sign using only email, then get a magic link in the email and use that one to sign up/in? In other words, sign in only with email, without ever setting up a password.