title: B2C modifying entered from B2C login username before loging-in to AD
body: <p>I'm using Azure AD B2C Local Accounts Sign-in with custom policies.
  Is there a way to intercept the username entered before validation, modify it and then continue with validation with the modified name?</p>
  <p>I am using a single tenant for multiple organizations and by concatenating organization with username i want to create a uniqueness to resolve more then 1 user from 2+ organizations  having the same username.</p>
  <p>looking at
  <a href="https://stackoverflow.com/questions/69133525/transform-username-in-azure-ad-b2c-authentication">Transform username in Azure AD B2C authentication</a>
  did not help, am I missing something?</p>
  <p>Thank you</p>