I'm at a real loss with trying to get an HDR signal to my Bravia HDR tv. My set up is as follows, AppleTV 4k to Denon AVR-6400H to Sony Bravia XBR-75X850X (4K Ultra HD). All connections are via Maya Ultra High Speed 8K HDMI cables. The AVR is connected to the TV via the ACR\/eACR HDMI ports. When I try to set 4K HDR 60hz signal to come from the AppleTV it does a connection test...and always fails and reverts to 4K SDR 60hz. Is there something I'm doing wrong with this setup? Any guidance is appreciated.