@Nichouse Welcome to the forums. What is the EXACT error message? Can you check that the username and password on the Hub is yours, and not 'setup@plusdsl.net'?
That explains it all. Yes, the username needs to be yours, in the format 'yourusername@plusdsl.net', with the password being that which you chose at account setup, and without the quote marks.
Exactly when did you receive the notification you were good to go?
Good to hear you have it going. As an aside, it is an idea to give it up to 11.59PM on the go-live day to allow all the PN back-end to complete.