Note that I have 3 devices - 1 andoid, 1 iPhone x on latest iOS, and 1 iPhone SE on older iOS. Only the iPhone X cannot see the Yamaha via Spotify Connect. So there is some bug on the iPhone X or latest iOS version causing this issue. I spent hours fiddling with network settings on all devices. What a waste of time. Note I also have issues setting up an Airport Express with the iPhone. Definitely a bug.