I just both an Sirius receiver for my 2006 A4 3.2 Quattro

After installing the receiver and go to the satellite radio option, it keeps giving me the massage...

"This vehicle is equipped for a simplified installation of satellite radio - using your existing radio. To order satellite radio service, please contact your Audi dealer"

I've tried calling Sirius but they need the radio ID to help and I don't have that. Using the VIN doesn't work either.

Thanks in advance for your help!