Dolby Atmos not working Apple TV 4K
I hooked up my Apple TV 4K to my Onkyo Receiver. I'm getting 4K HDR video but I'm not getting my Dolby Atmos or TRUEHD sound. On my Apple TV remote, I select audio as Apple TV 4K. When I switch audio to Onkyo Receiver, the receiver switches to Airplay. I have better sound but there's a delay in the audio.
Any suggestions
Apple TV 4K, iOS 11