Thanks guys, it's great to make contact with other RS6 owners! xbin* thanks a lot for the mod help!
Kevin, check the back of your unit to make sure the wired remote is plugged in. It's a little plug that looks like a mini headphone jack. The avic is installed by hand at the port, I think, and it would be easy for any installer to miss this.
The service dept might do a good job but you might be able to fit it yourself. Just pull off the fascia around the radio and then undo the bolts you see.
Tip: put a think blanket or pillow on the console where you will rest the head unit, there