r - Shiny dashboard, user authentication

I am trying to include a shiny dashboard inside a code snippet I found (https://github.com/treysp/shiny_password) that wraps a shiny app inside functions to set up user authentication.

This snippets works perfectly with fluidPage() but I noticed that it is not working when I wrap a dhasboardPage(): I try to log in, type in my username and my password, click on log in and then nothing happens, I am stuck on the login page. No error message in the console I use to fire up the server by calling runApp()

Do you have any idea of what might cause this particular problem?

Thanks in advance