How to divide the entry of credentials into two pages in ADB2C (as happens with the login to Microsoft services)

Question

I'm using ADB2C custom policies to customise the login page of an application.
I would like to provide a user experience for sign in similar to Microsoft, that is entering user credential (email and password) in two steps. I would also like to perform some checks on the email provided by the user before going on with the authentication. To better explain what I mean here is a screen of what I would like to achieve (please don't care about Sign in options, I don't need it for now):

ADB2C Custom policies permit a form with both email and password in the same page, but I want to split them (like the screen above) and check whether the password profile is marked as 'forceChangePasswordNextSignIn'. This is the flow:

• User enters email address and click Next button
• The policy checks the forceChangePasswordNextSignIn flag for that user/email address
• If set to false the login page shows the password form (normal experience)
• If set to true redirects the user to password reset page

Answer 1

Il cliente ha continuato nel forum Inglese, thread dupplico.