Digital Audio over multiple speakers?

I use Google Home to play music via my Naim Uniti Atom Headphone Amp to my loungeroom speakers (Adam Tensor Deltas) and my Kitchen Speaker (Naim Musso V2).
With Tidal, Soundcloud etc etc i just click the 4 small dots in the bottom right hand corner of the app so i can activate the 2nd speakers and the music will sync and play on both.
When im listening to youtube via my tv - which is connected via TV digital out and into the Digital in (3) of the Naim Uniti Atom i can play via multiple speakers?
It lets me select the 2nd speaker and visually “activates” but no volume comes through the 2nd speaker?
Any ideas?
In summary i am wanting to play youtube music via my tv over multiple speakers

Is your TV output set to PCM Stereo?

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