Thanks for taking trouble to reply. I have an Apple TV Box (A2169) and am wishing to send Apple Classical audio to my hi-fi via optical TOS link. I was upset to find that my standard HDMI audio extractor would not play some of the tracks in "The Works" namely Yuja Wang - "The American Project" or "Songbird" Maria Loudemitch but would happily play Brodsky Quartet & most other tracks. My initial research suggested my TV box did not support "lossless" or perhaps these recordings were protected by HDCP. Subsequently I purchased an "Ezcoo HDMI 2.0 audio extractor...rEDIDManagement scaler" from Amazon and found by setting the switches 3,4,5 to on. I could now play the elusive tracks with an excellent picture as well. I have no real way of knowing if this is just a work around or if I am really playing Dolby Atmos lossless.
Perhaps Apple may bring back the SPID link to the Apple TV box as of old. My Samsung TV (S95BA) has Apple TV built in and also an Apple Music app. This does not have a problem playing the tracks but the optical feed from the TV is not as good as the extracted signal. It's odd Apple decided to give high quality lossless music to the tiny I phone speakers although you can send the signal to your TV or Apple box. I notice that those two tracks are no longer in "The Works" I hope this my help someone!