That was my thoughts however I got Orange to re-issue and they are case and letter perfect.
My only thought was maybe the USB uses PAP whereas the router uses CHAP, but no way of knowing or changing ...
I have just acquired a BILLION ADSL 5200G router to replace my Speedtouch USB.
The credentials for Authenticating on ADSL are the SAME yet the router cannot log in.
PPP0A VC-MUX 0 38 Annex A all ...