My in-ceiling sonos speakers are connected to Arc through a Sonos Amp. It looks all OK and connected in the system but I can’t get any sound from the surround speakers. When I removed the in-ceiling speakers (and the amp) from the arc system and use them independently, they work perfectly so I know that there are not any issues with the speakers. But when I added them to the Arc system, they don’t work.

Interestingly, they were working just fine last month. But I haven’t used them for a month or so and they are not working any more. Not sure if it is connection issue, because when I try to trueplay tuning, it tells me it can’t find the speakers. My amp is connected with an ethernet cable.

Any ideas?