vbBeforeEnter - navigating to Azure login or to a different flow in the application

Summary:

Hi Experts,

Good morning/evening/afternoon.

I have an application with 5 flows in it and one flow is mapped as default flow from the shell page.

And also have unchecked the checkbox of from Require authenticated access, shell/settings/security/Require authenticated access. (Not to get the default IDCS login)

The requirement is as follows,

1. Once user opens the app it should check for the authenticated user, if YES - then go the default flow given in the shell.
2. If user is not authenticated then open URL with the Azure sign in page and once user sign's in then it will open the default page in the application.