A term that has been used for the processes (and therefore) pages that a user goes through before becoming an accepted/registered user is onboarding.
What is pre-login page?
Definition. Pre-login page. Displayed before attempting to authenticate the user. Login page. Only applicable when form authentication is being used, and provides the form for login.
What do you call a log in page?
Therefore, if the page that users are taken to, after a successful log-in is a dashboard, call it a dashboard. Trying to bless it with an unfamiliar fancy term will only serve to confuse users, and that's what we try to avoid here.