Azure B2C Entra multi tenant authentication Flow

Hy,

does anyone know how to configure Azure B2c authentication flow to get email address used by the user to sign in with Microsoft Entra multi tenant cusotm flow ?

When user sign in the first time, i'm no able to get email address to copy it in new azure b2c account created. 

I've followed  this documentation without success.

https://learn.microsoft.com/en-us/azure/active-directory-b2c/identity-provider-azure-ad-multi-tenant?pivots=b2c-custom-policy

Help will be appreciated.

Tks