Bumbing this because I have the same issue. It gives no feedback about why it's not working, it's just evident that it doesn't work. Quite sad that the best music player isn't compatible with the amazing DAC in the V10.
Could anyone with first hand experience of LG V10 please help me enable hi-res output? I'm using the latest version of PA build 820, Android 7.0 on a H960. I have no idea if I'm missing something important, since I'm reading that others seem to be able to enable to without issues. Technically the Hi-res switch setting works, but then it says Hi-res has failed, and the player then shows normal OpenSL ES 16-bit output. Thanks in advance.