Yep, finally got it all up and running last night using the username and bluetooth. Thank you very much for the help & tips! Finally have traffic updates :)
Some thing that seemed strange - when adding the Bluetooth communication you have to enter your Username & Password for the portal, yet you also have to add the same credentials under Nav (strangely the password on the Nav section gets * out but not under the Bluetooth section)
Also got the following response from Lexus so they might have had an issue at first launch which they fixed: