Technically the Sonos adaptor would be seen as 3.5mm to USB-C cable - I’d “follow the sound” when describing it. Which brings on the question: are you using the Sonos cable?

If so, can you describe your set up?

Hi 

I connected the Ace with the Sonos cable usb-c to 3.5mm to different devices like a MacBook Air, a phone with 3.5mm , to an iPhone with lighting adaptor but the result is always no audio.

Some weeks ago I had the possibility to try other Sonos Ace with the same connection and it worked fine. I bought mine just 3 days ago .

I hope this is just a cable issue 

I’d call support, they can do a few tests and maybe get you a working cable if that is what is needed.

I solved the issue bought a new cable from Sonos .

With the new one everything work as expected, now let see if I can have a refund from Sonos , I’ll contact the support.