I just got my Sonos ARC and have an existing pair of in ceiling speakers behind my couch powered by a Sonos AMP that I intended to pair with the ARC for surround sound. When I set up the ARC with HDMI ARC input I used the app to set up surrounds with my Sonos AMP and it pairs the two together but then the amp won't play any sound for either TV or Music through the rear speakers, the Sonos ARC plays just fine.
Am I doing something wrong? Everything is hardwired to a network switch connected to my router.