1. ARC is hit and miss. Try Optical.
2. Apps such as Netflix may not copy or use the TV's audio settings. That is I'm fishing around the app's settings to see what audio settings each app has.
The whole system needs re-thinking in my opinion.
No audio through my Yamaha RX-V861 receiver when using the Netflix App on a 2014 Panasonic TC-P60ST60. I've connected the HDMI 2 (ARC) to the HDMI Out on the receiver. Any tips? Thanks.