Is the a way to turn off focus changes sound on tvOS?

The question is quite simple: I'd like to turn off the sound on my tvOS application when I move between the cells of my UICollectionView.

The sounds produced is quite annoying after a while, so I'd like to turn it off.

I haven't found any method or property to do that, except for https://developer.apple.com/documentation/uikit/uifocusenvironment/2887504-soundidentifierforfocusupdate

I have tried to override this method in my view controller (which extends a UICollectionViewController), returning .none but the sound is still played.

Am I missing some obvious configuration?

Thanks,

Daniele