Help w/D+ stream audio to speakers

Ah, kinda embarrassed to ask but I am stumped on how to get the streamed Disney+ audio out to my speakers thru my AVR. 
Setup:
Integra DTM-7 AVR (2ch), LG UK6300 4K TV, Spendor SA1 bookshelves and sub. 
I don’t think that my integra AVR or my blu ray player (LG UK80) can stream D+ directly, but my smart tv can. I got that to work (D+ stream via tv) but how do I get the audio back to AVR to drive speakers?

Have ARC 4K HDMI cable between AVR and input 2 (ARC input) of TV, and I assumed this was only cabling needed (since whole point of ARC is two-way comm between devices as I understand it). Set AVR HDMI setting to ARC auto (only ARC related setting there was) and set TV audio out to ARC. 
But I get no sound from AVR regardless of AVR input selected. 
Any ideas?  I was hoping not to add another cable...

thanks in advance