The password and the PIN are two separate and distinct items. The PIN is the user-defined local security to get into the app, much like the PIN for securing the iPhone. The password is related to the more encompassing BMW Assist account that was set-up when the car was activated. This Assist name and password has plagued owners forever and has a lot to do with the disconnect between the CA setting up the account at car delivery and BMW.
2011 E93 M3 Convertible JB/FR | 2002 E46 M3 Convertible | 2002 E53 X5 3.0 | 2000 E39 540i | 1998 E36 M3 | 1988 E28 M5 | 1987 E28 528i