Hi, welcome to LQ!
While I don't have a resolution to your problem I think I can
explain why it's not working. I think (I'm not an expert on
screen, really, just a happy casual user) that screen requires
a tty/pty device to attach to, which it won't get from the
scripts run at init. Not sure how to remedy that.
But I doubt that you'd want to have a screen session detached as
the root-user from your users home in the first place?
What are you trying to achieve with that session?