Kenwood 9990 HD installed, no rear speaker output?

Chemy

Hi all. I just had a Kenwood 9990HD installed yesterday at a reputable shop. Everything works great except I have no sound out of my rear speakers. I am no guru when it comes to audio setup.

I playaed around with the usuall listening position, speaker settings etc.. The headunit is not recognizing the rear speakers. I can not individually adjust them as I can with the front speakers. Also, on the main audio page when I am listening to XM, at the bottom of the screen are the works "rear speaker" with a picture of a little speaker after it and an X after the picture. So it reads "rear speaker, pic, X"

Anyone have any idea on how to change this? I called the shop and they said everything was hooked up properly but did not how to adjust it without bringing it back in, which is quite a drive..

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2012 Nismo, PW #512. FI CBE SS w/12" Res, Stillen g3's, UpRev, Kenwood 9990HD, Focal speakers and tweeters, Wicked Cas corner box with JL 10" w6, 35% ceramic tint, full clear bra.