I use a HomePod pair as my living room TV speakers. I cannot get Wireless Audio Sync to work with my Apple TV 4K Wi‑Fi + Ethernet 128GB, HomePod (2nd generation) pair, and iPhone 16 Pro running:
tvOS 18.5
HomePod OS 18.5 (or whatever OS HomePod uses is called)
iOS 18.5
I verified my HomePod...